Halo: Reach: Complete New Alexandria.

Halo: Reach: Find me in the club.

Halo: Reach: Complete Exodus.

Halo: Reach: Complete Long Night of Solace.

Halo: Reach: Complete Tip of the Spear.

Halo: Reach: Kill the Elite Zealot before he can escape during Tip of the Spear.

Halo: Reach: Observe the logo of a buttoned-up mining company.

Halo: Reach: Complete Nightfall.

Absorb your fourth Boss Stem Cell

Halo: Reach: Access hidden UNSC radio chatter.

You beat the "Time Keeper" without taking a single hit.

Reach the Prison Depths for the first time.

Suicide by elevator.

You finished a daily challenge. Well done!

You slayed 100 elites. Badman.

Reach the Graveyard for the first time.

Listen to the faerie's song.

Absorb the Spider's Rune!

Reach the Slumbering Sanctuary for the first time!

You beat "Conjunctivius"!

Reach the Insufferable Crypt for the first time.

Unlock 10 skills.

Finish the game with "Ygdar Orus Li Ox" in your possesion!

Absorb your first Boss Stem Cell

Beat the Hand of the King.

Defeat 666 Enemies While in Havoc Form

Upgrade 5 Enhancements to Balanced

Unlock Everything

Collect 1,000,000 Souls

Upgrade Any Armor

Complete the Game on APOCALYPTIC

Save 20 Humans

Traverse the bridge to the EcoPod in the Wilds

Kill 3 enemies within 10 seconds after restoring all health with the Defibrillation

Clear the Second Chamber 40 Times

Clear the First Chamber 50 Times

Win a wager against the Gunsling King 5 times

Spend big at the Acquisitions Department

Kill a boss after covering it with glitter

Kill 100 enemies by knocking them into pits

Carry a large amount of money at once

Open the shortcut to the Third Chamber

Avenge Manuel

Get the jump on a Mimic

Always be flipping. Guns are for flippers

Defeat the Boss of the Fifth Chamber

Open the shortcut to the Second Chamber

Access the Temple

Kill a frozen enemy by rolling into it

Take in a large quantity of blood.