Geometry Wars: Retro Evolved 2 Cheats

Unlock Hidden 3D Stage-Viewer
Anytime during the single-player game, press the right bumper and back buttons at the same time to pause the game and enter a hidden 3D stage-viewer. Left thumbstick tilts and rotates the view, right thumbstick zooms in and out and pans left and right, and the triggers raise and lower the field of vision.

RB + Back: Enter 3D Stage Viewer

Achievements
Complete each achievement to get the allotted gamerscore.

Game Over (15): Reach the end of sequence.
Magpie (15): Collect 500 geoms in a single game.
Millionaire (15): Score at least 1,000,000 points in all single player modes.
Phobia (15): Score 1,000 points in Waves without collecting any geoms.
Rebound (15): Destroy 75 enemies in a game of Deadline using bullets bounced off of gates.
Slalom (15): Chain together 5 gates in 5 seconds. Crossing at least one gate every second.
Smile (25): 2, 4, 11, 15, 17, 18 and 19.
Surf (15): Dodge 8 lines of enemies in Waves without firing a shot, or destroying any enemies.
Treaty (15): Activate 30 zones in King without firing a shot, or destroying any enemies.
Unlocked All Modes (25): Unlock all game modes.
Wax Off (15): Perform the Wax On achievement twice in a single game, don't forget to breathe.
Wax On (15): Rub your ship along all four arena walls in Pacifism.