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

You Call This Security? (5 points): Bypass the electronic lock in Episode 1.
Heeeeeere's Deckard! (5 points): Chop your way out of the Internet Cafe with the Fire Axe in Episode 1.
Death To Soda (5 points): Create a ramp with the soda machine using your pistol in Episode 1.
Righty Tighty, Lefty Loosey (5 points): Extinguish the doorway fire using the water valve in Episode 1.
Upper Management (10 points): Unlock the warehouse exit in Episode 2.
Live Wire (10 points): Find the Black Order-eliminating electric switch in Episode 2.
Gum On My Shoe (5 points): Get stepped on by the Giant Golem in Episode 3.
Revenge Of The Soda (10 points): Escape the Nari-possessed vending machine room in Episode 3.
Jazz Hands! (15 points): Look at all "The Great Langtini" posters littering Times Square in Episode 3.
Jack? Beanstalk, Beanstalk? Jack (15 points): Destroy the Giant Golem in Episode 3.
Barf Piñata (10 points): Destroy a Blood Spider Queen in Episode 4.
Werewolf Whisperer (15 points): Defeat the first Alpha Werewolf in Episode 4.
Just Another Day At The Office (5 points): Eavesdrop on the Black Order as they cage up a Werewolf in Episode 4.
Tenderized (20 points): Defeat the Minotaur in Episode 5.
Bull In A China Shop (15 points): Entice the Minotaur to destroy all Graveyard wall sections in Episode 5.
I Hate Ornithology (25 points): Defeat the Griffon in Episode 5.
Science! (10 points): Run all Council Base lab experiments in Episode 6.
10-Piece Bucket (15 points): Shoot down the low flying Griffons in Episode 6.
Not OSHA Compliant (10 points): Cause the crane to drop the metal beams in Episode 7.
Power Outage (10 points): Take out the power to the Black Order outpost in Episode 7.
DouBull TrouBull (1 points): Survive the double Minotaur attack in Episode 8.
I Will Find You! (10 points): Free Vivian from captivity in Episode 8.
Petting Zoo (50 points): Complete game on Easy difficulty.
Animal Control (70 points): Complete game on Normal difficulty.
Savage Law Of The Jungle (90 points): Complete game on Hard difficulty.
Bookworm (20 points): Collect 1/2 of PDA pick-ups.
Mint In Box (40 points): Collect all PDA pick-ups.
Gun Nut (10 points): Fire all 8 projectile weapons in Single Player at least once.
Axe-Wielding Maniac (15 points): Kill 25 enemies with the Fire Axe in Single Player.
I Have A Problem With Intimacy (15 points): Use the Animus Pulse ability 10 times.
Fair-Weather Friends (15 points): Use Animus to change the frequency of an Aniform Control Device in Single Player.
Walkies! (5 points): Start and finish a ranked Multiplayer match.
Right Tool For The Right Tool (10 points): Fire every weapon available in any ranked Multiplayer match.
Warm Fuzzy Feeling (10 points): Fill 50% of your team's Monster Machine with Animus in a ranked 4v4 Multiplayer match.
Zookeeper (20 points): Kill 10 Werewolves in a ranked Multiplayer match without being killed.
Bounty Hunter (25 points): Kill 10 enemy players in a ranked Multiplayer match without being killed.
Leader Of The Pack (30 points): Be first place in kills in 10 ranked Multiplayer matches in a row.
Survivor (30 points): Survive a ranked 4v4 Multiplayer game without being killed.
Combat Veteran (45 points): Play 200 ranked Multiplayer matches.
King Of The Jungle (50 points): Win 50 ranked Multiplayer matches.

Additionally, there are ten secret achievements, all of which are currently unknown:

Secret achievement (10 points): Unknown.
Secret achievement (20 points): Unknown.
Secret achievement (20 points): Unknown.
Secret achievement (20 points): Unknown.
Secret achievement (25 points): Unknown.
Secret achievement (25 points): Unknown.
Secret achievement (25 points): Unknown.
Secret achievement (14 points): Unknown.
Secret achievement (35 points): Unknown.
Secret achievement (25 points): Unknown.