Endless mode - Successfully complete Arcade mode and all five stages in Stage mode to unlock Endless mode. In this mode, there are no Bosses, with the stages cycling endlessly.

Extra mode - Successfully complete Arcade mode to unlock Extra mode after Arcade mode is selected again. It features a higher difficulty.

Stage mode - Successfully complete a stage in Arcade mode on the Normal difficulty to unlock it at the "Extra" menu. You can then replay that stage whenever desired.

Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

Sure Shot (10 points): Defeated a wave of invaders without missing a shot.
Combo Meal (10 points): Destroyed at least 21 invaders in a row.
Goliath Killer (10 points): Defeated the first Boss Invader.
First Taste of Victory (10 points): Won an online match for the first time.
Lieutenant Rank A (10 points): Achieved Rank A at the end of a level.
Lone Wolf Victory (15 points): Completed the game in Arcade Mode.
Hot Streak (15 points): Triggered at least 4 rounds of Fever Time.
Space Invader Veteran (20 points): Won 25 online matches in VS Mode.
Team Victory (20 points): Completed the game in Co-op Arcade mode.
Hero of Nagoya (25 points): Achieved 1 ROW using the Nagoya Attack technique.
Space Commander Rank S (25 points): Achieved Rank S 3 times.
Take That! (30 points): Defeated a Boss Invader without missing a shot.