Defeat Stage 4 G with 4+ minutes left until detonation.

Complete "The 4th Survivor" extra mode.

Read all of the files.

Expand inventory slots to max.

Complete Claire's story on "Standard" or "Hardcore" with an S rank.

Destroy all Mr. Raccoons.

Combine two items together.

Shoot a zombie dog or a licker out of the air.

Complete Ada's segment.

Defeat an enemy with a knife.

Destroy a Mr. Raccoon.

Complete Sherry's segment.

Open a dial safe.