Here is the full list of all 134 Pixel Puzzles Aardman Jigsaws achievements.
Place Your First Piece
Puzzle Time!
Puzzle Complete
Place 100 Pieces
Place 2,500 Pieces
Place 10,000 Pieces
Place 1,000 Pieces
Place 500 Pieces
Complete Your First Pack
Complete 5 Puzzle Packs
Complete 10 Puzzle Packs
Complete 5 Puzzles
Complete 10 Puzzles
Complete 50 Puzzles
Complete 20 Puzzles
Complete Your First Puzzle
Complete 100 Puzzles