Frag-master
Killed 5 aliens with one Frag Grenade
30 
Elite Unit
Single player completed on Elite difficulty
25 
Battle-hardened
Single player completed
25 
Seasoned Squaddie
Completed a level in multiplayer
20 
Exterminator
Killed 1000 aliens
20 
Immobilised
Stunned 5 aliens with one Stun Grenade
20 
Hidden Treasure
Found all secret collectibles
10 
Tank
Took 500 damage without dying
10 
More Speed, Less Haste
'Vengeance' completed in 17 minutes or less
10 
The Informed
Picked up all the logs
10 
Survivor
Stayed alive for 8 minutes in Survivor mode
10 
Meat Grinder
Killed 250 aliens during multiplayer Survivor mode
10