Prime990

Heavy Reader Kill a librarian.

Make a List, Check it Twice Complete all instances of Naughty and Nice.

10 heads are better than 1 Kill 10 zombies in a row with headshots.

Rescue Ranger Save a group of Reds from Fascist captivity.

Trigger Happy Kill 100 enemies with assault rifles.

Inquisitor Kill 2 demons.

The Start of a Legacy Discover the truth about Darius's past.

He's Still on the Naughty List Deliver a present to Zinyak in 'The Santa Clawz'.

Raw Weapon Acquire best wpn through raw reinfrc.

Rootin' Tootin' Lootin' Loot 5 Exceptional Weapons.

Health Inspector Destroy all the green polyps inside Paul in 'Pop His Top'.

Walked the Path Finish the game on the "Death March!" difficulty level.

Combo King Get a combo of at least 30 during The Mercenaries.

Covenant: Warrior of Sunlight Discover Warrior of Sunlight covenant.

Wandering Spirit Completed "The Demon of Mount Hiei."

Cog in the machine Kill 5 enemies without being detected before infiltrating Black Zone.

Lightning Weapon Acquire best wpn through lightning reinfrc.

Strongest Weapon Acquire best wpn through standard reinfrc.

I'm Not Kissing That Kill the prince cursed into a toad.

Insomniac Visit the Insomniac Museum.

Predator and Prey Kill all of the Ancients in the Order of the Hunters in Makedonia.

Team Play Kill an enemy with a headshot while they are being harassed by Senu (The Hidden Ones)

It's Just a Bad Dream! Complete "Lost in Nightmares" with an S rank.

Snake Stealthily kill 15 Enemies.

You Again? Find all 3 Boat Captain Keys

Fire in the hole Kill 20 lurkers.

Prison Break Free 20 Rebels (The Hidden Ones)

Seeing Red Kill 10 enemies using the Fury of the Bloodline Ability.

Tragedy Tristis joins Aurora's Party.

Lone Lion Kill the Makedonian lion.

The Greater Good Complete Main DLC Quest "The Greater Good" (The Hidden Ones)

Get that Kid to a Psychologist Find all the snowmen vignettes in the North Pole.

Rigging the Race Destroy all the rival pony carts in 'At the Races'.

People Person Play with 10 different co-op partners for at least 15 minutes each.

Surgical Strikes Assasinate Tacito, Ptahmose and Ampelius (The Hidden Ones)

Blood of Leonidas Continue the bloodline.

Enchanted Weapon Acquire best wpn through enchanted reinfrc.

Sonar So Good Defeated the Bringer of Nightmares at the bottom of the ocean.

Dark Lord Reach "The Dark Lord" ending.

Spartan 2033 Complete the game in Spartan Mode.

Walls of the Ruler Complete the Walls-of-the-Ruler citadel (The Hidden Ones)

Ultimate Hot Potato Get 100 kills with the Grenade Launcher.

New Recruits Complete Side DLC Quests "Rise of Shaqilat" and "Shadows of the Scarab" (The Hidden Ones)

Hello Little Friend Get 250 kills with the Minigun.

Over the Moon Recover the moon.

Kategida Kindred Óengus joins Aurora's Party.

Mouth To Mouth Revived 10 players with oxygen.

Covenant: Darkwraith Discover Darkwraith covenant.

Fire on Water Set 10 enemy ships on fire.

End of your rope Cut a grappling hook rope with enemy on it.