Here is the full list of all 14 DUSK '82: ULTIMATE EDITION achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Finish the entire game
Finish level 25
Destroy every tree in the first level before finishing it
Defeat the final boss
Upload a custom level to the workshop
Get crushed by a toggle wall
Find The Soap
Kil 3 enemies with a single explosion
Kill 5 enemies with a single crossbow bolt
Create and test a level where you kill 10 enemies and exit in 3 or less moves
Kill an enemy by pushing a barrel down a conveyer belt
Kill yourself with an explosion
Finish any level with 2500 points or more
Finish any level