Here is the full list of all 46 Sackboy: A Big Adventure achievements.
Even Scarlet didn't get all the achievements, you're truly a Knitted Knight of legend.
Collect all the stickers in a single World.
Complete Highs and Glows... without throwing the Whirltool.
Pick up, and hold on to, a Boomblebee Hive for 60 seconds.
In multiplayer, get the top score on the scoreboard 20 times.
In multiplayer, start a dance party with your friends.
In multiplayer, high five with a friend.
In multiplayer, clobber one of your chums as the champ.
In multiplayer, snatch an item from the clutches of another player.
Simultaneously slap each other.
In multiplayer, get gold in any Knitted Knight Trial while carrying another Sackperson.
In multiplayer, snag the most Collectabells in a level 20 times.
In multiplayer, save your fallen friends from certain doom!
Find all of Gerald's secret spots.
Find and pick up every fish, paintbrush and cocktail umbrella on your journey.
Ace 30 levels by completing them without dying.
In multiplayer mode, earn 10 Ace level goals.
Team up to take down the Topsy Turver.
Show off what you've learned and finish the Wonderplane's final challenge!
Get a Gold on the Knitted Knight’s ultimate trial.
Earn Gold on the scoreboard in 50 different levels!
Pick up and throw 30 of Vex's minions to their doom.
Defeated Vex, destroyed the Topsy Turver and saved Craftworld!
Triumphed over the vile Vex at the very centre of Craftworld.
Create your own custom Emote in Zom Zom's shop then show the world.
Defeat multiple minions simultaneously 10 times.
Cleaned up N.A.O.M.I's code.
In multiplayer, complete a Teamwork Level.
Stun 30 of Vex's minions.
While in the air, perform four actions before touching the ground.
Defeated the Bringer of Nightmares at the bottom of the ocean.
Achieve all the level goals for 10 different levels.
Fill your wardrobe with 300 costume pieces.
Save a custom-made costume to your Wardrobe.
Defeat 30 of Vex's minions from a distance.
Cleared the Colossal Canopy of its pest problem.
Collect a full chain of Timed Score Bubbles 30 times.
Over the course of your adventure, collect 3000 points while sliding.
Faced off against the Master of the Uproar on the Soaring Summit.
Earn a Gold rank in any Remix level.
Defeat 30 of Vex's minions by bouncing on them.
Get a golden level badge by completing all the Level Goals for a single level.
Earn a Gold rank in any Knitted Knight Trial.
Discover the Trials of the Knitted Knights.
Complete your first Costume.
Pushed back the Uproar for the first time.