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

Empire Level 1 (5 points): Complete Level 1 on any difficulty.
Empire World 1 (10 points): Complete World 1 on any difficulty.
Empire World 2 (10 points): Complete World 2 on any difficulty.
Empire World 3 (15 points): Complete World 3 on any difficulty.
Empire World 4 (20 points): Complete World 4 on any difficulty.
Beastie Combo (5 points): Get a Beastie Combo by shooting a certain amount of only 1 type of beastie.
All Beastie Combos (30 points): Get all the Beastie Combos by shooting a certain amount of each of the special beasties.
2x Multiplier (5 points): Get the multiplier to x2 in Single Player.
10x Multiplier (25 points): Get the multiplier to x10 in Single Player.
Millionaire Twins (20 points): Both players get a million points each in Multiplayer.
10x Multiplier Twins (20 points): Both players get their multiplier to x10 in Multiplayer.
Black Belt Grandmaster (35 points): Complete all 16 levels on Black Belt in Single Player.