Here is the full list of all 45 Get Packed: Fully Loaded achievements.
Complete Stage One
Complete Stage Two
Complete Stage Three
Complete Stage Four
Complete the game
Send yourself away in the van
Complete Every Challenge
Throw a Pizza on top of the van
Get knocked out by a flying keg
Knock down a tree with a car
Knock a guard out with a sarcophagus
Dive up a flight of stairs
Destroy a porta-potty with a jackhammer
Hit a character over 10 meters
Collect every trophy
Knock out a guard with a cannon ball
Stop the traffic with the stop sign
Pack a parked car
Cause -$3000 in damages in one forklift race
Four players hold one item at the same time
Throw the same object between two players 5 times without it hitting the ground
Dive over 20 meters
Pack 20 objects in the first minute
Pack a total of 1000 items
Travel over 50 miles
Pack $2000 worth of items and cause -$2000 in damages, in the same match
Knock out a police officer and send them away in the van
Pack every cat in the game
Send off a client object within 5 seconds of it being requested
Smash all the windows in a house
Kidnap and pack a pedestrian
Spin the rotating door with all four players for 30 seconds
Suck up a total of 25 ghosts
Pack the Atlas ball
Get 3 stars on every level
Complete every level on destruction mode
Get 3 stars on every level in destruction mode
Win 5 competitive games
Complete Stage Five
Complete every level in Time Attack mode
Get 3 stars on every level in Time Attack mode
Survive 300 seconds on any level in Time Attack mode
Get 3 stars on every level in all game modes
Complete Stage Six
Knockout the alien in Doswell Debacle