Item description:

With this 3 saves you can earn following trophies in the game but only these. No other trophies will pop and saves are tested!

Complete every campaign level with a full team of four players.
4 Player Co-op
Load save and play level 6-4 with 4 players and trophy will pop.

Complete the Campaign on Hard difficulty.
Hard
Load save and play level 8-4 on hard and trophy will pop. Can do it alone or with other players.

Complete the weapon mastery for any weapon.
Reach Rank 100.
Complete the weapon mastery for 3 weapons.
Level 100 + Weapon Mastery
Load save and play level 1-1. Do 1 headshot at the tower, 1 Multikill with pistol and kill 3 Zombies with shotgun in one shot, to earn all 3 trophies.