Complete Prosper Bluff and speak with the Singer in the Bastion
Complete the Hanging Gardens and speak with the Survivor in the Bastion
Complete the Wharf District
Get 3 kills with the Sniper Rifle without missing a shot.
Get a Revenge kill with a backstab.
Run 25 kilometers.
Stab an enemy to death while under the influence of Jarate.
In a team with no Medics, be the first person to switch to Medic after a teammate calls for 'Medic!', and then heal 500 health.
Heal a teammate who's taking fire from 4 enemies at once.
Accumulate 25000 heal points as a Medic.
Join a game that one of your friends is in and then deploy an ÜberCharge on him.
Kill an enemy Spy that you have been healing.
Heal an Engineer as he repairs his sentry gun while it's under enemy fire.
Be healing a teammate as he achieves an achievement of his own.
Have an ÜberCharge ready before the Setup phase ends.
Complete 10 levels in Inventor Mode
Travel all the way across World 3.
Escape the apartment block raid.
Complete each class to unlock the next.
Kill 3 enemies with one bomb
Earn your first triple-gold award
Collect all 10 red skulls in any single level
Complete any level-specific Reward Challenge
Successfully reach the Rescue Camp.
Enter the Las Palmas stash house via the back door and kill Juan Garcia Cruz.
Complete 'The Naked City'.
Survive The Passing Campaign.
Deploy an ammo upgrade and have your team use it.
Kill a Spitter before she is able to spit.
Travel all the way across World 2.
Register a high score on the leaderboards
Beat Transition in Normal difficulty
Chained 100 Beats
Escaped Nether Mode
Miss a Beat with an extended Paddle
Block all Beats during a Challenge
Complete Astral Academy
Collect all experience in Astral Academy
Unlock the Head Crab (10 bandages)
Beat Spooce-Shrub Forest
Get all the Mudokons in the level accounted for (before they end up getting slaughtered by sligs).
Collect 250 (un-regenerated) Spooces
Complete all test chambers in the Excursion Funnels co-op course
Perform 2 aerial gestures before touching the ground in co-op
Perform all 8 gestures of your own volition in co-op
Unlock CommanderVideo
Find and inspect 95% of all clues.
Achieve maximum rank.
Drive more than 194.7 miles.
