Here is the full list of all 20 Mangavania achievements.
Level 1 completed
Level 2 completed
Level 3 completed
Level 4 completed
Level 5 completed
Level 6 completed
Level 7 completed
Level 8 completed
Level 9 completed
Level 10 completed
Level 11 completed
Level 12 completed
Level 13 completed
Level 14 completed
Level 15 completed
Level 16 completed
Level 17 completed
Level 18 completed
Level 19 completed
Level 20 completed