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
Defeat the final boss
Finish level 25
Find The Soap
Finish any level with 2500 points or more
Kill an enemy by pushing a barrel down a conveyer belt
Finish any level
Destroy every tree in the first level before finishing it
Get crushed by a toggle wall
Kill 5 enemies with a single crossbow bolt
Kill yourself with an explosion
Upload a custom level to the workshop
Create and test a level where you kill 10 enemies and exit in 3 or less moves
Kil 3 enemies with a single explosion