Hi everyone, welcome to my guide. So there are 2 ways to get all the achievements; The first one is doing it alone all by yourself and second one is teaming up with 3 of your friends or using multiple devices of your own to do it. Obviously the latter is faster and easier to do, so try to get your friends to help you or use multiple devices of your own to make the progress faster(Your PC, your phone, your Tablet, use android emulators on PC ...). I will explain both.
For emulators I will recommend using BlueStacks.

All the classic mode achievements are below this topic.

This achievement is straight forward; Just get a kill in classic mode!

Just get 5 kills in classic mode!

From this achievement it is recommended playing with friends or using multiple devices by your own to boost the speed up. For doing this, other than your main account you only need 3 friends or 3 other accounts on 3 devices to start a private classic match and boosting your progress; After starting the private match whenever your main acc is imposter just kill everybody asap (Don't forget to decrease the impostor kill cooldown form the match settings), but if you are not impostor let your friends kill everyone if they are going for this achievement as well, but if not just vote out the imposter asap and start again. You'll be able to get this achievement in no time.

This achievement is in my opinion the hardest and longest to get but exactly do the method I told you in Assassin achievement and you'll get it in no time! This achievement is a hidden achievement.

Just finish 10 tasks in total to get this achievement in any mode (Hide n seek included as well)!

From this achievement you can use the teaming up method I told you before to get it asap. Before starting the match with your friends or different devices, go to the match settings and increase the number of tasks as much as you can. Most probably you'll get crew mate, so start doing the tasks all by yourself and tell your friends to let you do them all.

Just do all I said about the MANAGER achievement again and you'll get it in no time! This achievement is a hidden achievement.

Completely straight forward; Just win 3 games in the Skeld map!

Win 3 games on the Mira HQ map!

Win 3 games on the Polus map!

Win 3 games on the Airship map!

For players who team up with their friends or use multiple devices this is so easy; Just start a private classic match with 2 imposters and kill 1 crew mate to win the game with both you and other imposter alive!( Note that for this one you'll need 5 players in total to be able to start the match).
For players who want to this alone just choose classic mode games with 2 imposters from the menu filters and play games with 2 imposters only until they are able to get imposter and win the game with both of the imposters alive(It may take some time if you are doing it this way)! This achievement is a hidden achievement.

For this one all crewmates have to complete all their tasks and the taskbar one the top left of the screen will eventually become complete and you'll win and get this achievements. For players boosting this with their friends, they'll get it in no time; But for players doing this alone you have to play few games until you can get this because every crewmate have to cooperate!

You have to win a game as an impostor by sabotaging some thing critical (oxygen, reactor) and the crewmates have to fail to fix it and you win the game this way. For players who is boosting this achievement it's simple just tell your friends to not fix the sabotage. For players who are going to do this alone the way to success is to kill most of the crewmates first until there is only 2 or 3 remaining at most; Then you should sabotage something critical and not letting them fix it by scaring them(for example when you sabotage reactor on Skeld go near on of the 2 points that crewmates have to go there to fix it, and start venting and coming up so they know you are impostor are scared for their lives).

It's straight forward, win a game by killing all crewmates; shouldn't be difficult to get.

It's really easy to get; You only need to win a game as crewmate, but you have to be alive at the end of the game as well.

For this achievement you need to win as an imposter by voting not just killing. For players boosting it's straight forward what they should do. But for players doing it alone, here's a tip: kill most of the crewmates but do it wisely so no one is suspicious of you at all; When there is only 2 crew mates and you left call a meeting and try to frame one of them wisely and try to convince the other crewmate to vote him and get this achievement at last.

This one is pretty easy after a few tries. You have to successfully do the admin card swipe task in the first try; for doing this you need to swipe the card not too fast nor too slow. You can practice this in the practice mode by your own and the go to public game and do it and get the achievement. This achievement is a hidden achievement.

It's completely straight forward, just sabotage the lights after spotting a crew mate and then cut the lights out and kill him before crewmates fix the lights.

This one is really easy for players boosting the achievements just ask your impostor friend to kill you while scanning in medbay; But if you are doing it alone the fastest way to this is joining game and see if you get a medbay scan as a task if you got it stay in the game but if you didn't just leave and join another game. When you get the task go in the medbay from the start of the game and start scanning and cancel it in the middle and do it again until the impostor spots you and kill you while you are scanning. This achievement is a hidden achievement.

Really easy one; Just sabotage something and go fix it yourself asap. This achievement is a hidden achievement.

This is really easy for players boosting just kill 3 crew mates before the game ends or the meeting is called( for this one you need at least 5 players in total to get the achievement). But for players doing it alone it might be little tricky because you need to very precise and careful with your kills so nobody find the bodies before you kill 3 of them. So here's tip: I recommend you to make a game server and make it public so others can join but the point is for you to change the game settings and decrease the impostor kill cool down so you can kill crew mates with only 10 seconds cool downs. It really helps a lot just find crew mates alone in a not crowded place kill them and go find another and kill him in 10 seconds and the third one as well. This achievement is a hidden achievement.

So for players boosting this easy peasy . For players doing it on their own this one is a little tricky as well; for this one I recommend not doing your tasks and go check on everyone from the start until you are certain someone is imposter and tell your crewmates and only vote for him. (You may have to try several times to get this one)

Pretty much straight forward; Win a game as an impostor only by killing and not venting even once. You shouldn't vent at all in the whole game, just kill... This achievement is a hidden achievement.

This is pretty easy one. When you join a match make sure the shape shifter mode is on. Then play until you get the impostor role as well as shape shifter at the same time. From now on it's easy peasy; just find a person alone the shape shift into his color and then kill him.

This one is easy as well and you can get it in a few tries. Find a match that has Guardian angel mode on. Then try to be the first person to get killed because the first person who dies gets guardian angel with this mode on. Already you know who is impostor because he's killed you so follow him and go a little bit faster than him and always be ahead of him so when he tries to kill someone you protect that person so you get your achievement.

All the hide n seek mode achievements are below this topic.

Really easy and straight forward and you should be able to get it in a few tries. Just hide and survive until the end using your hiding strategies and venting until the crewmates win in hide n seek mode. You should be alive at the end of the match!

It's really straight forward and you should be able to get it with practice and good knowledge on the map. You have to kill all the hiders in hide n seek mode as an impostor. Here's a really important tip: use "Q" button for killing instead of clicking and it should be much easier to kill everyone even if the flashlight mode is on. Just spam the Q button when you see a crew mate.

This one is straight forward as well and you should practice few times before you can get it easily. You have to complete all your tasks in hide n seek mode. For this you have to utilize your hiding strategy as well as your timing to get this done before getting killed.

So this one's easy but takes time to get. You need to win 10 times as a crew mate in hide n seek mode(note that it's not necessary to be alive at the end of the game).

It's the exact same thing as "YOU CAN'T RUN" achievement but this time you need to win 50 times as crew mate in hide n seek mode.

OK this achievement and the next one is kinda hard and takes time to get but I'll tell you a tip so you'll get it in no time. For this you need to get 100 kills as the seeker in hide n seek mode. But the chances of getting seeker in every game is super low and takes forever, so here's my tip: If you didn't know already, you can choose the seeker in hide n seek mode from the game settings if you set the game mode to private. So go and host a hide n seek mode and make it public so everyone can join; when there is 14 or 15 total players in your server then change the mode to private and go to the laptop thingy that you change your game setting from and choose your self as seeker and start going on rampage and kill everyone. (It will take about 1 hours at most)

It's the same as "YOU CAN RUN" achievement but you need to kill 200 hiders as an impostor instead. Do the exact same method I told you on the previous achievement descriptions.