Destroy All Humans! 2 Cheats

PlayStation 2 Cheats
Pause the game and go to the Archives section of the menu and hold down [L3], then enter the following:

[X], [Square], [Triangle], [Circle], [Square], [Circle], [Triangle], [X]x2: Salad Days with Pox & CryptoUnlimited Ammo
[X], [Circle], [Square], [Square], [Triangle]: Unlimited Ammo

Arkvoodle Cult Unlockables
Complete various Arkvoodle Cult missions to unlock hidden items and a hidden weapon.

Alien Artifact Detector: Successfully complete the last Arkvoodle Cult mission in Albion.
Arkvoodle Cult missions: Successfully complete main missions to unlock more of these.
Burrow Beast (Super Weapon): Successfully complete the final Arkvoodle Cult mission.
Final Arkvoodle Cult mission (Takashima): Collect 30 Alien Artifacts.
Furotech Cell Detector: Successfully complete the final Arkvoodle Cult mission.
Last Bay City Arkvoodle Cult mission: Start the last Arkvoodle Cult mission in Albion, then go back to Bay City.

Gallery
Crypto's Back!: Complete Gene Blend: Crypto's Back
Desperately Seeking Natalya: Complete Gene Blend: Natalya's Secrets
Furons A Go Go!: Complete Gene Blend: Furons A Go Go!
It's the Sixties: Complete Gene Blend: The Swinging Sixties
Oh the Humanity!: Complete Gene Blend: Oh the Humanity!
Popular Mechanics: Complete Gene Blend: Popular Mechanics
The Martians...Err, Blisk are Coming!: Complete Gene Blend: The Blisk Files