Complete the following achievements to unlock Gamerscore points.

Achievement	How to unlock
"Mr. Bubbles-- No!" ( 20 points )	Take down your first Big Daddy in a non-private match.
Against All Odds ( 30 points )	Finish the game on the hardest difficulty level.
All Plasmids ( 20 points )	Find or purchase all 11 basic Plasmid types.
All Weapon Upgrades ( 20 points )	Find all 14 Power to the People weapon upgrades in the game.
Big Brass Balls ( 25 points )	Finish the game without using Vita-Chambers.
Big Spender ( 15 points )	Spend 2000 dollars at Vending Machines.
Bought a Slot ( 5 points )	Buy one Plasmid or Tonic Slot at a Gatherer's Garden.
Choose the Impossible ( 50 points )	Achieve Rank 40.
Dealt with Every Little Sister ( 50 points )	Either Harvest or Save every Little Sister in the game.
Disgusting Frankenstein ( 10 points )	Become a Big Daddy for the first time in a non-private match.
First Research ( 5 points )	Research a Splicer with the Research Camera.
Fully Upgraded a Plasmid ( 10 points )	Fully upgrade one of your Plasmids to the level 3 version at a Gatherer's Garden.
Fully Upgraded a Weapon ( 10 points )	Install the third and final upgrade to any of your weapons.
Grand Daddy ( 25 points )	Defeat 3 Big Daddies without dying during the fight.
Little Moth ( 20 points )	Achieve Rank 20.
Man About Town ( 10 points )	Play at least one non-private match on each multiplayer map.
Master Gatherer ( 30 points )	Gather 600 ADAM with Little Sisters.
Master Hacker ( 20 points )	Hack 30 machines at a distance with the Hack Tool.
Master Protector ( 15 points )	Get through a Gather with no damage and no one getting to the Little Sister.
Max Plasmid Slots ( 10 points )	Fully upgrade to the maximum number of Plasmid Slots.
Mother Goose ( 20 points )	Save your first Little Sister in a non-private match.
One Research Track ( 20 points )	Max out one Research Track.
Parasite ( 10 points )	Achieve Rank 10.
Prolific Hacker ( 20 points )	Successfully hack at least one of every type of machine.
Proving Grounds ( 20 points )	Win your first non-private match.
Rapture Historian ( 40 points )	Find 100 audio diaries.
Research Master ( 20 points )	Max out research on all 9 research subjects.
Skin Job ( 20 points )	Achieve Rank 30.
Trap Master ( 15 points )	Kill 30 enemies using only Traps.
Two-Bit Heroics ( 10 points )	Complete your first trial in a non-private match.
Unnatural Selection ( 10 points )	Score your first kill in a non-private match.
Upgraded a Weapon ( 10 points )	Upgrade any weapon at a Power to the People Station.
Welcome to Rapture ( 10 points )	Complete your first non-private match.