Full list of all 37 Night at the Museum 2 achievements worth 1,000 gamerscore. It takes around 3-4 hours to unlock all of the achievements on Xbox 360.
Completed Washington Art Museum
Completed Anubis Columns Puzzle
Repaired all Broken Exhibits in Washington Art Museum
Activated all Paintings Traps in the Washington Art Museum with the Flashlight
Acquired all "Paint Tube" Collectibles
Acquired the Pressed Penny Collectible in Washington Art Museum
Completed the Trilobite Puzzle in the National Museum of Natural History
Returned the Hope Diamond
Tamed all Animals
Acquired all "Bone" Collectibles
Acquired the Pressed Penny Collectible in National Museum of Natural History
Completed National Museum of Natural History
Completed National Air and Space Museum: Hangar
Completed Lunar Lander sequence with at least Two Bars of Health Remaining
Acquired the Pressed Penny Collectible in Lincoln Memorial
Obtained all Awards in the Awards Room
Acquired the Pressed Penny Collectible in National Air and Space Museum
Acquired the Pressed Penny Collectible in ALL Museums
Collected 100% of Hidden Items
Acquired all "Pilot's Wings" Collectibles
Defeated Kahmunrah
All Museums Explored
Acquired all "Wrench" Collectibles
Completed the Autogyro Flight
Restored Power to Amelia Earhart's Plane
Completed National Air and Space Museum: Able Chase
Navigated the Vending Machine
Freed Able from her Restraints
Escaped Federal Archives
Acquired the Pressed Penny Collectible in Federal Archives
Acquired all "Souvenir Document" Collectibles
Acquired the Pressed Penny Collectible in Smithsonian Castle
Acquired all "Postcard" Collectibles
Gave the Gum to Stonehead
Completed Tablet Tutorial at New York Museum of Natural History
Acquired the Pressed Penny Collectible in New York Museum of Natural History
Acquired all "Museum Magnet" Collectibles