MODIFY

1. 
   FIRST CONTACT

   Complete Room 1
   73%
2. 
   SECTOR CLEAR

   Complete Room 10
   64%
3. 
   EVERYTHING IS BACKWARDS

   Complete Room 20
   18%
4. 
   TILL RESET DO US PART

   Complete Room 29
   9.0%
5. 
   CONSERVATION OF MASS

   Complete Room 39
   9.0%
6. 
   ODD ONE OUT

   Complete Room 48
   18%
7. 
   UNAUTHORIZED PROCESS

   Finish The Final Room
   18%
8. 
   STATUE

   Petrify yourself
   64%
9. 
   MEDUSA

   Un-Petrify yourself
   45%
10. 
    VOWS

    Join a Link Channel
    27%
11. 
    Forgery

    Give yourself Auth
    64%
12. 
    PERSISTENCE

    reset 50 times
    18%
13. 
    ARCHITECT

    Save a custom level
    18%
14. 
    DOGFOOD

    Play your own level
    18%
15. 
    SAME DAY DELIVERY

    Publish a level
    18%
16. 
    SOMEONE ELSE'S PROBLEM

    Play a community level
    18%
17. 
    TOURIST

    Play 10 community levels.
    0.0%
18. 
    LIKE AND SUBSCRIBE

    Subscribe to a Steam Workshop Map
    18%
19. 
    CRITIC

    Vote in the Workshop
    18%
20. 
    DID YOU SEE THATSecret

    Steam withholds the description of a secret achievement.
    9.0%
21. 
    READ THE FINE PRINTSecret

    Steam withholds the description of a secret achievement.
    18%

Names, descriptions and icons are the game’s own, as Steam publishes them; the share is how many owners have unlocked each, from Steam's global figures for 21 of them.