Summer is over


Tourist


Beat it


These are not missable.

I took a thing


Average looter


True Looter


For these I recommend either BAYSAL or Shorpy's guides for finding the valuables
https://steamproxy.net/sharedfiles/filedetails/?id=2271038550
https://steamproxy.net/sharedfiles/filedetails/?id=2833741874

Whoops


Wasn't me
[In Progress] Destroy 10,000,000 voxels

Now what
[in Progress] Destroy 100,000,000 voxels

Chances are you'll get Whoops towards the end of a complete playthrough. For the others... using workshop mods is really the only feasible way, or at the very least playing a lot of community-made maps.

Bare bones


Where's my hammer?


Where's my hammer? overlaps with Bare bones, so you can get them both done in one.
In Making Space grab some boats and get ramming. You can use the crane to steal and destroy the required safe as well. This mission is a breeze, just make sure not to swing your hammer or use any other tools.



Swiss Cheese

Fairly challenging since you can't get hit by bullets or the rockets. Not going for all objectives definitely helps.



The floor is water

A tough one. You have to be very strict about being *near* water. (Unsure if breaking water barrels count).




Runner up

Enter The Chase and get running! Not that difficult as long as you make sure to spend time inside of buildings rather than getting gunned down in the street.



Big brother

Not too difficult if you don't go for all objectives. I recommend the westtmost garland by the shipping bay, the star on the roof, and the two garlands on the east side.

Above and beyond

Easy with workshop mods, but using Rocket Thruster in sandbox can work too.



McFly

Vehicle Boosters are your friend. I got it while going for Liftoff.

Liftoff

Can be a little finicky. The best place is the staircase ramp on Villa Gordon, you just need to trim the bedroom's roof a little. I prefer to drive the White Hummer with a couple Vehicle Boosters.



Speedrunner

The first mission of the game "The Old Building Problem" is your best bet. Made trivial with the Rocket Launcher.



Visit the developers

Viewing the credits through the option on the main menu works.


Meticulous planner

You are able to get this on any mission, though it's... weird on missions without alarm boxes.


Completionist

Oofta, but there's enough guides out there for every mission. Shouldn't be too hard with help.



I was on a boat

Open up the Marina Sandbox and turn around. Then let loose.



Paintjob

There's a small rowboat in a cave at Quilez, Droid Abduction spawns you right next to it. Use your spraypaint to finish the job, you'll get a mini-paycheck when you've covered enough. (You have to paint the inside of the boat as well)



Drive for treasure

Thanks to Beefandleather for finding this.

[A recent update has allowed you to visit the island in Sandbox mode, which makes the achievement much easier]

The sunken car is only available at the island resort that acts as your home base while doing the island levels. If you have progressed past that point in the story... you either reset your save file or download the Level Menu workshop mod.
https://steamproxy.net/sharedfiles/filedetails/?id=2678740215
This is extremely difficult to do without mods since all of your tools are removed while at the island. I had to use the single propane tank on the map to destroy enough of the car that I could drag it across the ocean floor. The achievement unlocks when you have *driven* the car a couple of feet.




Sharpshooter

At a certain point, you add a shooting range to the west of your home base. One of the machines is a Skeet Launcher. Activate it and destroy each disk before they hit the ground. Upgraded shotgun recommended.



Couch potato

You eventually install a treadmill in the home base, shoot it apart then restart the mission.