For this guide, some suggestions will require you to have beaten Adventure Mode at least once. For example,

• For the "Don't Pea in the Pool" achievement, I say to "complete a pool level using only catapult-plants (cabbage, kernel, and melon)." You don't get these plants until the roof levels, which are after the pool levels.
  
  
• For the "Good Morning" achievement, I say to "use puff-shrooms and coffee beans to complete this achievement." You don't get any mushroom plants or the coffee bean until later on.

I believed that going through Adventure Mode twice would be the easiest to do these achievements as you need to go through it again to find the Yeti zombie.

I got all of the achievements in roughly 62 hours; however, that does not mean that it will take you 62 hours to complete. You may do it faster or slower than me.

The percent (%) of Steam players who have a particular achievement will vary over time. As such, that portion of the guide will not always be accurate (but will still be in the correct general area).

Difficulty Rating: 1/5
"Blow up a zombie using a potato mine"

Any zombie that comes into contact with a charged potato mine will be killed. You get the plant very early in the game, so it's very easy for this to be your first achievement. However, note that potato mines have a resting period after they are planted before they are ready to blow a zombie(s) up!

84.7% of Steam players have this achievement!

Difficulty Rating: 1/5
"Blow up 10 zombies with a single cherry bomb"

While this is relatively hard to happen in early levels, this achievement can easily be done during a wave of zombies in a later level in Adventure Mode!

Or, you can do this in survival mode, where there is a lot of zombies at once.

65.8% of Steam players have this achievement!

Difficulty Rating: 1/5
"Pick up 30 coins in a row on a single level without letting any disappear."

This achievement is straight forward and very easy to do - you just simply have to keep clicking on the coins. It is unlikely you will miss any coins since it takes a while for them to disappear.

One of the main difficulties is getting 30 coins in a single level. This can easily be done in three-wave levels as well as any survival levels. But, overall, this achievement is very easy.

53.4% of Steam players have this achievement!

Difficulty Rating: 1/5
"Hypnotize the lead dancer zombie"

All you need to do is plant a hypno-shroom in front of a dancing zombie. The dancing zombie will eventually attempt to eat the hypno-shroom, which will then hypnotize it.

48.7% of Steam players have this achievement!

Difficulty Rating: 3/5
"Complete adventure mode"

Straight forward - just complete adventure mode!

44.1% of Steam players have this achievement!

Difficulty Rating: 1/5
"Bowl over 5 zombies with a single Wall-Nut."

This achievement is very easy with dancing zombies that allow you to get three easy hits (with a single Wall-Nut). Then, if there are zombies behind it, you are likely to hit five total zombies, getting this achievement.

This achievement is arguably luck-based; but, it is likely that you will get it after completing either of the minigames for Wal-Nut Bowling (usually the second one is easier, but this can be done with the first Wal-Nut Bowling minigame).

38.4% of Steam players have this achievement!

Difficulty Rating: 1/5
"Complete a daytime pool level without using pea shooters of any kind."

Complete a pool level using only catapult-plants (cabbage, kernel, and melon). You can easily do this on level 3-1.

19.4% of Steam players have this achievement!

Difficulty Rating: 3/5
"Collect all 49 plants"

You must get all plants from Adventure Mode AND buy any plants in Crazy Dave's shop. This includes all "pink plants" as well as the Imitater.

Usually, after completing the game (with a Gold Sunflower Trophy), you will have generated enough money to buy all plants (and a lot more). Thus, one can just play the game normally and you will eventually have enough money to get this achievement.

19.0% of Steam players have this achievement!

Difficulty Rating: 1/5
"Enable Mustache Mode"

You have to type "mustache" or "moustache" while playing a game or when you're on the main menu. This will make some types of zombies have mustaches.

To learn more about cheat codes, visit my guide shown below.
https://steamproxy.net/sharedfiles/filedetails/?id=1790352696
17.4% of Steam players have this achievement!

Difficulty Rating: 4/5
"Beat all 20 mini games"

You have to beat all of the 20 mini games in the game. Generally, they are straight forward and easy to complete, while others may require more time. Use resources like YouTube and google to figure out how to complete a specific mini game.

17.1% of Steam players have this achievement!

Difficulty Rating: 3/5
"Get 8000 sun during a single level."

Overall, this achievement is easy to complete but it may take a few tries (and it's time-consuming). Go onto Survival: Day (Hard) and then plant two rows of sunflowers. If possible, upgrade these sunflowers into twin sunflowers. Plant as you normally do, but you will get a surplus amount of sun that will eventually turn into over 8000 sun.

While a player may be able to complete this in Survival: Day, you may run out of time. A player may be able to do this in Survival: Pool (Hard) or Survival: Pool, but I found Survival: Day (Hard) to be the easiest to complete this achievement. I also found this to be the most "natural" way to complete this - you don't have to purposely postpone a level to get more sun and then wait a while to collect sun.

Playing the mini-game "Zombiequarium" is also a common way to get this achievement.

You can also do this in Survival: Endless very easily (using two rows of sunflowers/twin sunflowers).

16.4% of Steam players have this achievement!

Difficulty Rating: 4/5
"Get the golden sunflower trophy"

You have to complete Adventure Mode, all mini games, all puzzles, and all survivals (excluding Endless versions of specific games).

Individual games may be difficult - if you are stuck on a certain level, look up a guide on YouTube or Google.

Overall, this achievement is not difficult, but it's quite time-consuming. After you are finished the mini games, you simply just grind out the puzzles and survivals - they aren't that difficult.

14.5% of Steam players have this achievement!

Difficulty Rating: 2/5
"Discover the top secret zombie"

You have to replay Adventure Mode after completing it once and then get to level 4-10 to find the Yeti (the top secret zombie).

To learn more about the Yeti zombie, visit my guide shown below.
https://steamproxy.net/sharedfiles/filedetails/?id=361819108
13.5% of Steam players have this achievement!

Difficulty Rating: 2/5
"Complete a nighttime level without planting any Mushrooms."

Quite simple - just use sunflowers and pea shooters! To start off a nighttime level, use potato mines to fight off the first few zombies. Then, after the first few zombies are killed, you should have enough sun to start planting some pea shooters. Continue to use pea shooters and potato mines to complete the level. Do not be afraid to use some lawn mowers to complete this.

I would recommend doing this on level 2-1 of Adventure Mode.

11.7% of Steam players have this achievement!

Difficulty Rating: 2/5
"Defeat a normal roof level without using any catapult plants."

This is slightly difficult to do. Here are some common strategies...

1. Use pea shooters near the right side of the roof (where there isn't a slope). Defend the plants with Wall-Nuts and Tall-Nuts.

2. Use Gloom-shrooms and garlics to lead the zombies between two rows of Gloom-shrooms. While this one does work with easier roof levels, you may not get enough sun in time to do this method.

3. Farm sun and plant only Chompers. With enough sun, you can have multiple rows of Chompers.

It is easy to do this on level 5-1.

10.5% of Steam players have this achievement!

Difficulty Rating: 3/5
"Defeat 2 Gargantuars with Corn Cob missiles in a single level."

This is fairly simple to do. You can usually complete this in Survival: Endless as, in later levels, there will be a lot of gargantuars.

Corn Cob missiles deal an amount of damage equivalent to one Cherry Bomb, one Jalapeno, or one Squash. Thus, it may be useful to have two corn cobs ready to use on a gargantuar(s).

10.3% of Steam players have this achievement!

Difficulty Rating: 4/5
"Get to 20 flags in Survival Endless"

This achievement is slightly difficult to do and it may take a while; but, overall, getting to 20 flags is easy. Make sure to grind up sun early on and have a lot of defense for all sorts of zombies.

This is the strategy that got me to 20+ flags...

1. Plant two rows of sunflowers and twin sunflowers.

2. Plant peashooters and repeaters to start. Then, upgrade to melon-pults and then winter melons.

3. Use some cattails since not a lot of zombies go in the water. These will help with digger zombies, balloon zombies, and imps from gargantuars.

4. Plant pumpkins on everything. Use the Imitater to do this faster.

5. Use spikerock for vehicle zombies and slowing down gargantuars.

6. Combination of cherry bombs, squashs, and jalapenos to take down gargantuars and other tough zombies.

By the time you get to 20 flags, you should still have over 8000 sun (maybe even more).

There are many other strategies out there that work well, but I only had the plan to get to 20 flags. The above will get you farther than 20 flags, but I am not particularly sure how far it will get you.

9.8% of Steam players have this achievement!

Difficulty Rating: 3/5
"Grow the Tree of Wisdom to 100 feet"

Since each food packet is 2,500 and grows one foot of the tree, it will cost 250,000 to grow the tree to 100 feet. This may take a lot of money grinding in order to get, or, you can use the infinite money glitch.

To learn more about the infinite money glitch, visit my guide shown below.
https://steamproxy.net/sharedfiles/filedetails/?id=2394824817
9.7% of Steam players have this achievement!

Difficulty Rating: 2/5
"Complete a daytime level by planting only Mushrooms and Coffee Beans."

This is very simple to do - especially on Level 1-1 and/or Level 1-2 of Adventure Mode where there are only regular zombies to defeat.

Use puff-shrooms and coffee beans in order to complete this achievement.

9.6% of Steam players have this achievement!

Difficulty Rating: 4/5
"Get to a streak of 15 in Vasebreaker Endless"

This is probably the second hardest achievement to get. A combination of luck, skill, and (most importantly) patience is needed to get this achievement.

1. Start with the vases on the right side and work your way towards the left. You want the column farthest to right to be open so that you can plant repeaters there.

2. Be patient. Do not try and break too many vases at a time. That will lead to you losing since there will be too many zombies on the screen at once and not enough time for plants to defeat them.

3. Use squashes to defeat high-defense zombies. Using two squashes will kill a gargantuar.

4. Over time, you gather up sun, which can be used for cherry bombs. Use them wisely, but also do not be afraid to use them when needed. You can use two cherry bombs to kill multiple garantuars (should they be in the same vicinity) or one cherry bomb to kill a large group of zombies.

5. Plant seeds disappear over time, but they still take a considerable amount of time for them to disappear. As such, wait before using a squash to see if you need it to kill a gargantuar or a buckethead zombie.

6. The plantern can be used to see the contents of all of the vases around it (1 box away in each direction, including diagonally). As such, use it in a place that will give off the most information.

7. Green vases always have plant seeds. However, that does not mean you should break them right away. I found that breaking a few vases to the most right column and then breaking the green vases will allow you to have different places to put the plants.

7.1% of Steam players have this achievement!

Difficulty Rating: 5/5
"Get to a streak of 10 in I, Zombie Endless"

This is, by far, the hardest achievement to get. A combination of luck and skill is needed to get this achievement.

1. I would recommend at least 1,000 sun at the end of level one, and 2,000 sun at the end of level two. If you fail to get over 2,000 sun at the end of level two, I would recommend restarting.

2. Memorize how many hits each zombie can take. For example, it is critical to remember that an imp zombie can walk over a spikeweed as it takes only two of the three needed hits to kill it.

3. Take out magnet-shrooms as quickly as possible.

4. Use a dancing zombie on a non-threatening lane (not on the first or last lane as you want the dancing zombie to spawn zombies above and below it) to take out three lanes. The dancing zombie is especially useful when there are many potato mines, squash, or chompers in a particular row.

5. Sometimes, it can be fine to send a football zombie (175 sun) to take out a row. However, you can also use a digger zombie (125 sun) to take out an entire row and then use an imp zombie (50 sun) to eat the brain. This should only be done if there are no plants that can attack it from other lanes (such as a threepeater or starfruit) and there are no split peas. If those conditions are met, it may be safer and more reliable to do the digger zombie/imp zombie combination, especially in cases with wall-nuts and snow peas that would otherwise leave only a chance for the football zombie to get through. Do note that digger zombies are killed by potato mines.

6. Only use bungee zombies to take out magnet-shrooms or sunflowers. When a bungee zombie steals a sunflower, all of the sun that the sunflower would give off if it were eaten is given off when the sunflower disappears. However, since the bungee zombie itself requires 125 sun, only use it if it's safe and you desperately need sun.

7. Remember, you do not need to eat all of the plants. The goal is to eat all of the brains, so you can use pole vaulting zombies to securely jump over the last plant in the row (even a chomper or a potato mine) to get to the brain.

7.0% of Steam players have this achievement!

Made by Miya

All content is from my brain and personal experiences.

Special thanks to those that have given out awards!