Here is the full list of all 22 Pixel Puzzle Makeout League achievements.
Remembered what part she is
Unlocked all special themes
Completed the Puzzle Maze
Remade the world / Set off on your own
Couldn't resist
Found true love
Became whole with Piecea
Became partners with Chess
Solved 200 pixel puzzles
Found the truth with Crossword
Saved Sudoku
Made a costly mistake
Explored the digital realm
Survived an encounter with the Villain
Solved 100 pixel puzzles
Tried something new with Sudoku
Went on a sneaking mission with Chess
Learned about Crossword's past
Climbed a mountain with Piecea
Let the timer run out
Got to know a member of the Puzzle League
Escaped the Villain's clutches