Games you own:

Just a few:

Fallout 3
Oblivion
Morrowind
Rollercoaster Tycoon 1 and 2 and expansions
The entire Sims series pre-dating Sims 3
All the Tomb Raider games
The entire Half life series
Halo 1 (The full series however on the console)
FEAR
The entire Serious Sam series
Unreal 1 and 2
Rise of Nations
The entire Age of Empires series
Empire Earth 1
Mass Effect
Bioshock
Heretic 1 and 2
The entire Doom series
Duke nukem 3d and Manhattan project
Sin
Heretic 1 and 2
Sim City 4 (very fun game still strangely)
Far Cry 2
Team Fortress series
Wolfenstein 3d and Return to Castle Wolfenstein
Age of Mythology
Quakes I, II, and III (but not IV)

I have a xbox 360 and the games I own are as folllows:

NFS Undercover
Last Played Online: Never
10 of 1000
2 of 50 Achievements

Gears of War 2
Last Played Online: Never
95 of 1750
10 of 79 Achievements

BF: Bad Company
Last Played Online: 10/19/2008
70 of 1000
4 of 50 Achievements

Left 4 Dead
Last Played Online: 6/2/2009
195 of 1250
13 of 60 Achievements

Call of Duty: WaW
Last Played Online: 6/2/2009
25 of 1500
2 of 66 Achievements

Ghostbusters
Last Played Online: Never
175 of 1000
12 of 50 Achievements

[PROTOTYPE]
Last Played Online: Never
60 of 1000
4 of 40 Achievements

Condemned 2: Bloodshot
Last Played Online: 6/17/2009
0 of 1000
0 of 38 Achievements

Guitar Hero: Aerosmith
Last Played Online: 6/2/2009
215 of 1000
16 of 49 Achievements

Mortal Kombat vs. DCU
Last Played Online: Never
0 of 1000
0 of 50 Achievements

GRID
Last Played Online: Never
105 of 1100
9 of 54 Achievements

Fallout 3
Last Played Online: Never
40 of 1550
3 of 72 Achievements

Ultimate MK3
Last Played Online: 11/10/2008
45 of 200
4 of 12 Achievements

The Bourne Conspiracy
Last Played Online: Never
25 of 1000
2 of 49 Achievements

Hexic HD
Last Played Online: Never
10 of 200
2 of 12 Achievements

Beijing 2008
Last Played Online: 7/6/2008
15 of 1000
1 of 50 Achievements

Unreal Tournament 3
Last Played Online: 7/6/2008
10 of 1000
1 of 50 Achievements

Hellboy: TSoE
Last Played Online: Never
0 of 1000
0 of 31 Achievements

Rainbow Six Vegas 2
Last Played Online: Never
120 of 1000
7 of 47 Achievements

EA SPORTS FN 3
Last Played Online: Never
0 of 1000
0 of 8 Achievements

Call of Duty 4
Last Played Online: 4/20/2008
690 of 1000
29 of 37 Achievements

Alaskan Storm
Last Played Online: Never
75 of 1000
3 of 20 Achievements

PGR 3
Last Played Online: 5/10/2008
45 of 1000
3 of 25 Achievements

NINJA GAIDEN 2
Last Played Online: Never
75 of 1250
13 of 70 Achievements

The Incredible Hulk
Last Played Online: Never
15 of 1000
2 of 50 Achievements

Marvel Ult. Alliance
Last Played Online: Never
0 of 1250
0 of 58 Achievements

Big Bumpin
Last Played Online: Never
0 of 200
0 of 12 Achievements

UEFA EURO 2008
Last Played Online: Never
90 of 1000
6 of 48 Achievements

Scene It? LCA
Last Played Online: 5/1/2008
450 of 1000
21 of 42 Achievements

ET: QUAKE Wars
Last Played Online: Never
15 of 1000
1 of 50 Achievements

GTA IV
Last Played Online: 5/24/2008
345 of 1500
21 of 65 Achievements

Devil May Cry 4
Last Played Online: 4/30/2008
20 of 1000
2 of 46 Achievements

SEGA Superstars Tennis
Last Played Online: Never
200 of 1000
11 of 45 Achievements

Gears of War
Last Played Online: 4/28/2008
400 of 1250
23 of 57 Achievements

NBA 2K7
Last Played Online: 4/24/2008
0 of 1000
0 of 50 Achievements

NHL 2K7
Last Played Online: 4/24/2008
0 of 1000
0 of 17 Achievements

Crackdown
Last Played Online: 4/21/2008
175 of 1250
13 of 50 Achievements

Avatar: TLA: TBE
Last Played Online: 4/17/2008
1000 of 1000
5 of 5 Achievements

Assassin's Creed
Last Played Online: 4/14/2008
170 of 1000
9 of 44 Achievements

Track and Field
Last Played Online: 4/13/2008
75 of 200
6 of 12 Achievements

Quake 4
Last Played Online: 4/13/2008
15 of 1000
1 of 50 Achievements

Call Of Duty 3
Last Played Online: 4/12/2008
25 of 1000
2 of 26 Achievements

Halo 3
Last Played Online: 4/11/2008
535 of 1750
24 of 79 Achievements

BioShock
Last Played Online: 4/10/2008
960 of 1100
49 of 51 Achievements

Worms
Last Played Online: 4/2/2008
10 of 200
1 of 12 Achievements

Streets of Rage 2
Last Played Online: 4/2/2008
45 of 200
5 of 12 Achievements

Luxor 2
Last Played Online: 3/27/2008
76 of 200
5 of 12 Achievements

Pac-Man C.E.
Last Played Online: 3/27/2008
40 of 200
4 of 12 Achievements

UNO
Last Played Online: 3/27/2008
105 of 200
7 of 12 Achievements

Feeding Frenzy
Last Played Online: 3/27/2008
90 of 200
6 of 12 Achievements

Boom Boom Rocket
Last Played Online: 3/22/2008
55 of 200
6 of 12 Achievements

Two Worlds
Last Played Online: 3/5/2008
40 of 1000
6 of 41 Achievements

Oblivion
Last Played Online: 3/3/2008
90 of 1250
3 of 60 Achievements

PlayOnline Viewer
Last Played Online: 2/3/2008
No Gamerscore
No Achievements

FINAL FANTASY XI
Last Played Online: 2/3/2008
0 of 1250
0 of 57 Achievements

Saints Row
Last Played Online: 1/22/2008

I copied and pasted it from Xbox.com since I have so many lol I don't get a chance to play very often anymore I might try to make some time this weekend.