Goal: 80 games
2009: 101
In parenthesis is my score out of 10 for the game.
Some of the games here I have also beaten in past years, and some I will have played through multiple times this year, but I'm only counting each game once per year.
January (7 total):

Assassin's Creed 2 (6/10)

Borderlands (9/10) - all side quests done + all of the Zombie Island DLC + General Knoxx DLC

Bayonetta (9/10)

God of War II HD (8/10)

New Super Mario Bros. Wii (9/10)

Dragon Age Origins (10/10)

Zelda Spirit Tracks (7/10)
February (9 total):

Mass Effect 2 (9/10) - all side quests done

Call of Duty Classic (6/10)

God Hand (10/10)

Metal Gear Solid 2: Sons of Liberty (10/10)

Auditorium (8/10)

Grand Theft Auto IV: The Ballad of Gay Tony (9/10)

Peggle Nights (8/10)

Bioshock 2 (10/10)

The Misadventures of P.B. Winterbottom (9/10)
March (11 total):

And Yet It Moves (8/10)

Ratchet and Clank Future: A Crack in Time (7/10)

Wolfenstein (6/10)

Heavy Rain (9/10) - Platinum Trophy

God of War III (8/10)

Grim Fandango (10/10)

Phantasmagoria (2/10)

Full Throttle (9/10)

King's Quest (5/10)

Star Wars The Force Unleashed (5/10)

The Simpsons Game (6/10)
April (8 total):

Metal Gear Solid 3: Subsistence (10/10)

Spider-man: Web of Shadows (5/10)

Trials 2: Second Edition (8/10)

VVVVVV (9/10)

Splinter Cell Conviction (9/10)

Shin Megami Tensei: Devil Summoner (9/10)

Condemned: Criminal Origins (5/10)

Machinarium (9/10)
May (7 total):

Half-Life 2: Episode 1 (9/10)

Half-Life 2: Episode 2 (10/10)

Burnout Revenge (9/10) - Elite License
NES: Mega Man (8/10)
NES: Mega Man 2 (9/10)

Alan Wake (9/10)

Super Mario Galaxy 2 (10/10) - Collected 120 stars
June (10 total):

Red Dead Redemption (8/10)
iPod Touch: Chaos Rings (8/10)

A Boy and His Blob (7/10)

3D Dot Game Heroes (9/10)

Raiden IV (8/10)

Metal Gear Solid 4 (10/10)

The Saboteur (8/10)

Tatsunoko vs. Capcom Ultimate All-Stars (9/10) - got every character's ending
N64: The Legend of Zelda: Ocarina of Time (10/10)

Dragon Age Origins: Awakening (10/10)
July (6 total):

Deathsmiles (9/10)

Might and Magic: Clash of Heroes (9/10)

Eat Lead: The Return of Matt Hazard (3/10)

Limbo (9/10)

Lost Odyssey (10/10) - did all sidequests and got 1030/1100 achievements, main party level 99

Hydro Thunder Hurricane (8/10)
August: (2 total):

Arc Rise Fantasia (9/10)

Deadly Premonition (10/10)
September (4 total):

Dead Rising 2 Case Zero (9/10)

Bioshock 2 Minerva's Den (10/10)

Halo Reach (7/10)

Metroid: Other M (5/10)
October (6 total):

Dead Rising 2 (9/10)

Enslaved: Odyssey to the West (10/10)

Castlevania: Lords of Shadow (4/10)

Super Meat Boy (9/10)

Comic Jumper (6/10)

Kirby's Epic Yarn (10/10)

Costume Quest (10/10)
November (7 total):

Silent Hill Shattered Memories (9/10)

Vanquish (8/10)

Fable III (7/10)
SNES: Super Metroid (10/10)
PS1: Silent Hill (9/10)

Professor Layton and the Unwound Future (10/10)

Sonic Colors (6/10)
December (7 total):

Need For Speed Hot Pursuit (9/10)

Broken Sword Shadow of the Templars Director's Cut (7/10)

Battlefield Bad Company 2 (7/10)

Majin and the Forsaken Kingdom (10/10) - 100% items collected + true ending

Donkey Kong Country Returns (9/10)

Final Fantasy XIII (7/10)

Dante's Inferno (7/10)
Total: 85