Full list of all 56 Game Room achievements worth 1,000 gamerscore. It takes around 60-80 hours to unlock all of the achievements on Xbox 360.
Spent 36 hours total playing games in your arcade
Won 20 Challenges!
Won 10 Challenges!
Won 20 Medals of each type
Themed an entire arcade with unique Themes
Spent 24 Hours in your arcade playing games
Reached Level 14
Won 10 Time Spender Medals
Won 10 Medals of each type
Spent 16 hours in your arcade playing games
Reached Level 11
Won a Challenge!
Reached Level 8
Won 48 Medals
Won 45 Medals
Won 42 Medals
Won 39 Medals
Won 36 Medals
Won 33 Medals
Reached Level 5
Spent 8 hours in your arcade playing games
Won 5 Time Spender Medals
Played a single game for 1 hour continuously
Won 30 Medals
Won 27 Medals
Won 10 Survivalist Medals
Won 24 Medals
Spent 4 hours in your arcade playing games
Won 21 Medals
Won 18 Medals
Won 5 Survivalist Medals
Won 10 Point Buster Medals
Won 15 Medals
Won 12 Medals
Won 5 Point Buster Medals
Played a Friend's Game Cabinet
Reached Level 2
Won 9 Medals
Won 6 Medals
Won 2 Medals of each type (2x Point Buster, 2x Survivalist, 2x Time Spender)
Visited a Friend's arcade
Sent a Challenge!
Filled a Room in your arcade
Won 3 Medals
Won a Medal of each type (Point Buster, Survivalist, Time Spender)
Won your first Medal!
Beaten your own High Score in a game, while looking cool!
Activated 1 Mascot in your arcade
Placed a Game Cabinet in your arcade
Placed 5 arcade Decorations in your arcade
Placed 1 Decoration in your arcade
Placed 5 unique Themes in your arcade
Placed a Theme in your arcade
Visited the Showcase Arcade
Reach Level 17
Reach Level 20