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