Infantry Attack

1. 
   This Is My Boomstick

   Upgrade any weapon
   72%
2. 
   Say Hello To My Little Friend

   Upgrade a drone
   27%
3. 
   Universal Soldier

   Upgrade a trooper
   46%
4. 
   I Love The Smell Of Napalm In The Morning

   Use airstrike
   25%
5. 
   I Ain't Got Time To Bleed

   Use first aid kit
   25%
6. 
   Yippee Ki-Yay

   Boost fire rate to 200% or more
   73%
7. 
   1st Base

   Finish base 1
   56%
8. 
   2nd Base. Nice!

   Finish base 2
   49%
9. 
   3rd Base

   Finish base 3
   43%
10. 
    Home Run

    Finish base 4
    37%
11. 
    5th Base

    Finish base 5
    32%
12. 
    There Is No 6th Base

    Finish base 6
    27%
13. 
    7th Base

    Finish base 7
    24%
14. 
    8th Base

    Finish base 8
    21%
15. 
    9th Base? Really?

    Finish base 9
    19%
16. 
    Practically A Second Base, But In Binary

    Finish base 10
    17%
17. 
    Will Anyone Even Read This?

    Finish base 11
    16%
18. 
    All Your Base Are Belong To Us!

    Finish base 12
    15%
19. 
    Not A Rookie Anymore

    Get Private rank
    43%
20. 
    Veteran

    Get Sergeant rank
    20%
21. 
    Keep The Change, Ya Filthy Animal

    Defeat 1000 enemies
    42%
22. 
    Anyone Else Want To Negotiate?

    Defeat 5000 enemies
    20%
23. 
    Don't Lose Head

    Reach at least level 25 in Headshot Challenge
    16%
24. 
    No Guts, No Glory

    Obtain a medal in Hardcore Event
    18%
25. 
    Terminate! Terminate!

    Destroy 75 drones
    39%
26. 
    Blues Brothers

    Destroy 100 vehicles
    34%
27. 
    Hail To The King, Baby

    Defeat tank boss
    62%
28. 
    And You Go In Pieces

    Defeat plane boss
    48%
29. 
    Get To The Choppa!

    Defeat helicopter boss
    41%
30. 
    The Evil That Men Do

    Defeat 7 bosses
    22%
31. 
    Run To The Hills

    Escape the chase
    41%
32. 
    Afraid To Shoot Strangers

    Assault the enemy
    37%
33. 
    Aces High

    Win a dogfight
    35%
34. 
    Be Quick Or Be Dead

    Stop the convoy
    53%

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 34 of them.