Here is the full list of all 40 Desktop Cube-Man achievements.
Complete Challenge 15
Complete Challenge 14
Reach Level 15
Use gatlin
Reach Level 14
Complete Challenge 13
Reach Level 13
Complete Challenge 12
Reach Level 12
Reach Level 11
Reach Level 10
Complete Challenge 9
Complete Challenge 10
Complete Challenge 11
Play challenge mode with friends and survive 60s
Complete Challenge 8
Complete Challenge 7
Reach Level 9
Reach Level 8
Use shotgun
Use automatic rifle
Reach Level 7
Reach Level 6
Change to new action type
Open the chat window
Reach Level 5
Reach Level 4
Open the about window
Complete Challenge 4
Complete Challenge 5
Complete Challenge 6
Complete Challenge 1
Complete Challenge 2
Complete Challenge 3
Use handgun
Reach Level 3
Play challenge mode alone and survive 60s
Reach Level 2
Reach Level 1
Start challenge mode