Here is the full list of all 48 The LEGO Movie - Videogame achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Achieved 100% Completion
Completed all Golden Instruction Builds
Collected all Golden Manuals
Collected all pairs of Pants (Single Player)
Achieved The Special in every level (Single Player)
Completed all Master Builds in Server Room as Benny
Used the Kragle Gun to shoot Ma and Pa Bad Cop in the Relic Room.
Found and destroyed the Invisible Jet
Defeated 20 Enemies As Sheriff Not-A-Robot
Earned 1,000,000,000 studs
Defeated 30 Enemies as Emmet Cowboy
Kragelized 10 people with the Kragle Gun
Smashed a chair as Bad Cop
Collected all of the Red Bricks (Single Player)
Switched from Vitruvius to Ghost Vitruvius
Shot Emmet with Robo Skeleton.
Played as Abraham Lincoln and Lady Liberty
Switched from Good Cop (Scribble Face) to Bad Cop.
Purchased All Characters
Purchased All Master Builders
Customised your character.
Made a Fire
Scored 21 awesome dance moves in the Construction Site dance mini game.
Used Lord Business' Legs Machine
Completed Level 15 - The Final Showdown
Completed Level 14 - Bricksburg Under Attack
Played as Superman and Green Lantern
Completed Level 13 - Back From Reality
Completed Level 12 - Broadcast News
Completed Level 11 - Put The Thing On The Thing
Destroyed 50 Enemies as Metal Beard
Scored 21 awesome dance moves in the Kragelizer dance mini game.
Completed all Instruction Builds in Story Mode
Completed Level 10 - Infiltrate The Octan Tower
Completed Level 9 - The Depths
Completed Level 8 - Escape from Cloud Cuckoo Land
Collected all studs in a hacking mini-game
Completed Level 7 - Attack on Cloud Cuckoo Land
Killed 20 Enemies as Rage Unikitty
Completed Level 6 - Welcome to Cloud Cuckoo Land
Completed Level 5 - Escape From Flatbush
Completed Level 4 - Flatbush Rooftops
Completed Level 3 - Flatbush Gulch
Completed Level 2 - Escape From Bricksburg
Attempted a Master Build-It with a Non-Master Builder
Completed Level 1 - Bricksburg Construction
Completed an Instruction Build without losing any studs
Completed Prologue - The Prophecy