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