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Bada Boom Kill 50 aliens with explosive weapons.

Legacy of Rust Reach the end of 'Legacy of Rust'.

Oh, My Bad Kill your friends 1000 times.

For the Fallen Recover all 33 COG tags (on any difficulty)
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Kill It With Fire Immolate a total of 30 arachnoid enemies with the Incinerator.

For The Good Of All In Revelations, the Key must be opened.

Blood-Spattered Savior Rescue a total of 20 survivors in Infection.

Evilution Reach the end of 'TNT: Evilution'.

Plutonia Reach the end of 'The Plutonia Experiment'.

Blackout Historian In Blackout, unlock Reznov, Mason, Woods and Menendez

A Better Human Being Recover the Forge Item

Skill Collector - Nero Acquire all of Nero's skills.

Wizard's Diploma Beat the five base Challenges on Normal difficulty.

Archmage Kill 10,000 enemies.

Marble Got the marble quarry ready. Marble is better than stone.

Zombiepult In Gorod Krovi, launch 10 zombies into the air at the same time.

LUNATIC Finish the game in Insane mode

You think this game made itself? Watch the credits, start to finish

Sudden Temptation Quick Battle: defeated all warriors.

Untouchable Complete 8 different levels sequentially under par time without dying on Ultra-Violence or higher.

All Clear: Estel Clear all stages in single-player mode as Estel.

MEAT IS MURDER Activate Bubby.

Screen Wipe Obliterate 50 enemies with a single shot of the Calamity Blade.

Preemptive Strike In Classified, kill 50 Nova 6 Crawlers without letting them explode in a single game

New Recruit Unlock your first hero

Ultimate Warrior Unlock all alternate moves for one character.

Indiscriminate Headhunter Kill one of every enemy.

Back Slap Think carefully how to protect yourself from that rock.

Spiders Defeat 500 Spiders

This Damn Island In The Darkest Shore, explore the entire island.

Crawl for Help In Classified, while in last stand use a teleporter and then get revived in a single game

Little Lost Girl In Origins, release Samantha.

Coast 2 Coast Cross the water with a teleport grenade in Descent.

Level 10 Reach level 10
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Professor's Diploma Beat the five base Challenges on Hard difficulty.

Level 3 Stinky Sewers

Fading Shadows Complete Nightfall: Chapter I

A Better Tomorrow In Revelations,complete the cycle.

How low can you go? Hit 18 enemies with a single shot of the LZ-52 Limbo in Carrier.

Sage's Diploma Beat the five base Challenges on Bananas difficulty.

I Can't Quit You Dom Complete all acts in co-op (on any difficulty)
0/36

Senseless Axe of Violence In Blood of the Dead, kill 5 zombies with the Hell's Redeemer before it starts its return

A Dark Doorway Recover the Psi Gate

Ground Control In Moon, prevent each excavator from breaching the base in one game.

Genius Destroyer Defeat Monsoon without taking any damage on Hard difficulty or above.

Clown Wars Lead an army of 3 clowns.

Pit Lord Kill 100 enemies by knocking them into pits

Pump It Up In Rave in the Redwoods, Pack-a-Punch a weapon.

Isaac's Heart Kill Isaac with The Lost

The Air of Experience Raise a B-Spec driver to the peak of his career.