Antidote

1. 
   Forced Landing

   Launch the game for the first time.
   96%
2. 
   Rookie

   Win a game on easy mode.
   10%
3. 
   Seasoned Soldier

   Win a game on normal mode.
   10%
4. 
   Elite Operator

   Win a game on hard mode.
   2.0%
5. 
   Improvised Weapon

   Find the pipe.
   75%
6. 
   Crowd Control

   Find the baton.
   46%
7. 
   Compelling Argument

   Find the shotgun.
   52%
8. 
   Military Issue

   Find the assault rifle.
   40%
9. 
   Covert Ops

   Craft the silenced pistol.
   23%
10. 
    Hostile Contact

    Kill a Walker.
    88%
11. 
    Interception

    Kill a Runner.
    88%
12. 
    Piercing Elimination

    Kill a Pike.
    58%
13. 
    Armor Breach

    Kill a Riot.
    58%
14. 
    Heavy Target Neutralized

    Kill a Slobber.
    60%
15. 
    Meteor Protocol

    Find all 15 asteroid destroyers and win the game with them.
    4.1%
16. 
    Untouchable

    Finish a game without taking any damage.
    4.1%
17. 
    Lightning Extraction

    Finish in under 20 minutes on hard mode.
    2.0%
18. 
    Mission Report

    Find all notes.
    2.0%
19. 
    Brute Force

    Finish a game using only melee weapons.
    4.1%
20. 
    First Blood

    Die for the first time.
    83%

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 20 of them.