Here is the full list of all 22 So Much Stuff 3: Odds & Ends achievements.
Finish the Tutorial.
Complete a collectible.
Finish a Theme for the first time.
Complete 1 Collection Room.
Complete all Collection Rooms.
Use Hint for the first time.
Finish 1 Find the Difference.
Finish all Find the Differences.
Finish 1 Click to Swap.
Finish all Click to Swaps.
Finish 1 Jigsaw.
Finish half of the Jigsaws.
Finish all of the Jigsaws.
Finish 1 level from the So Much Stuff category for the first time.
Finish half of the So Much Stuff category scenes.
Finish all So Much Stuff category scenes.
Finish 1 Sort.
Finish half of the Sort.
Finish all of the Sort.
Finish 1 of each game type without using Hint.
Complete Collector's Edition.
Finish all 18 standard levels.