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

Gnoming (50 points): Find seven collectibles.
Solar (50 points): Find all 4 unique comic book covers.
Pack Rat (50 points): Find all collectibles in the game.
Speed Demon (50 points): Complete a play through of the game in record time.
Homerun (50 points): Perform a finisher move from the left side.
Slice and Dice (50 points): Perform a finisher move from the back.
Right Hook (50 points): Perform a finisher move from the right.
Stop hitting yourself (50 points): Perform a finisher move from the front.
Gladiator (50 points): Get 20,000 experience points.
The Buffet (50 points): Get 45,000 experience points.
Combo #5 (50 points): Perform 5 hits.
Shall we dance? (50 points): Perform one successful 7 hit jump combo attack.
When it's done (50 points): Complete the game.
Hard Target (50 points): Play through the game without dying.
Impulse 9 (50 points): Collect all weapons.
Deep End (50 points): Perform a drop zone kill.
Drop Dead (50 points): Drop an enemy in all drop zones.
Dodge This (50 points): Escape an incoming tether.
Nothing but Net (50 points): Escape an incoming net.
Hot Delivery (50 points): Slide tackle an enemy.