All PC unless stated otherwise

January (6)

 Spec Ops: The Line
 Gateways
 Broken Sword: Directors Cut
 Castlevania: Circle of the Moon (GBA)
 Rayman Origins
 Broken Sword 2

February (2)

 Mirror's Edge
 Chaos;Head

March (7)

 Corpse Party (PSP)
 Assassin's Creed: Brotherhood
 Dangan Ronpa (PSP)
 Ever17
 Professor Layton and the Last Specter (NDS)
 Sleeping Dogs
 DLC Quest

April (6)

 Super Hexagon (Hexagoner Mode)
 Kingdoms of Amalur: Reckoning (plus both story expansions)
 Metroid Fusion (GBA)
 High Seas Havoc (MegaDrive)
 Home on the Range (GBA)
 Anodyne

May (4)

 The Lion King (Genesis)
 Fate/stay night
 Bulletstorm
 Thomas Was Alone

June (3)

 1000 Amps
 The Walking Dead (all 5 episodes)
 Max Payne 3

July (3)

 Steins;Gate
 Mass Effect
 NBA 2k13 (spent ~70 hours on the game, beat and won the complete season in Create a Legend mode, so I guess it counts as a beaten game)

August (5)

 Icarus Proudbottom Teaches Typing
 Mass Effect 2 (+all DLCs)
 Persona 3 Portable (PSP)
 Pause Ahead
 Mass Effect 3 (+all DLC except for Omega)

September (6)

 Saints Row IV
 Pop'n Music - difficulty levels up to 15
 Fez (200%)
 Persona 4
 999: Nine Hours, Nine Persons, Nine Doors
 Alpha Protocol

October (4)

 The Last of Us
 Call of Duty: Modern Warfare
 Call of Duty: Modern Warfare 2
 Call of Duty: Modern Warfare 3

November (8)

 The Stanley Parable
 Asura's Wrath
 Call of Duty: Black Ops
 Escape Goat
 Umineko no Naku Koro ni: Legend of the Golden Witch
 Batman: Arkham Asylum
 Pop'n Music - difficulty levels 16 to 20
 The Walking Dead: 400 Days DLC

December (4)

 Umineko no Naku Koro ni: Turn of the Golden Witch
 World Mosaics 3
 Umineko no Naku Koro ni: Banquet of the Golden Witch
 World Mosaics 4

 2013 Total: 58