Eliminate 10 zombies that were damaged by the Energy Mine Artifact

Eliminate 10 zombies while your damage is increased by the Ring of Fire Artifact

Reach level 55 in Multiplayer

Reach max level with an operator in Multiplayer (base game operators only)

Win 50 matches of Multiplayer.

Unlock School in THPS1 Classic.

In Zombies, upgrade a skill.

Reach Vinland

Get 50 kills with lethal Scorestreaks in Multiplayer.

In multiplayer, clobber one of your chums as the champ.

In multiplayer, snatch an item from the clutches of another player.

Get 200 Eliminations in Multiplayer.