For this achievement, you have to play six games each of the games listed to unlock all the Theme Park Plaza Building Parts. Here is a list of the items that are unlocked from each game:
-“Twister” Mr. Potato Head Show Host Building Decoration (play two games)
-“Twister” Balloons Building Decoration (play four games)
-“Twister” Sky Laser Building Decoration (play six games)
-“Mouse Trap” Giant Cat Building Decoration (play two games)
-“Mouse Trap” Con-Trap-Tion Building Decoration (play four games)
-“Mouse Trap” Fireworks Building Decoration (play six games)
-“Yahtzee Hands Down” Special Sign Decoration (play two games)
-“Yahtzee Hands Down” Lighting Building Decoration (play four games)
-“Yahtzee Hands Down” Laser Show Building Decoration (play six games)
-“Clue” Themed Garden Building Decoration (play two games)
-“Clue” Cards Building Decoration (play four games)
-“Clue” Thunder and Lightning Building Decoration (play six games)
-“The Game of Life” Money Bags Building Decoration (play two games)
-“The Game of Life” Hot Air Balloons Building Decoration (play four games)
-“The Game of Life” Inflatable Figures Building Decoration (play six games)
-Theme Park Ticker Tape (play six games of each title)
The games can be any combination of Original and/or Remix, quick and/or full games. You do not have to win any games, just play them. Upon completing the sixth game of the final game, the achievement will unlock. Note that your profile must be signed in on the first controller for the game to count towards this achievement.
credit goes to blakgravy on xbox360achievements.