Here is the full list of all 30 The World's Hardest Game 3D Nostalgia achievements.
Reach Level 1.
Reach Level 2.
Reach Level 3.
Reach Level 4.
Reach Level 5.
Reach Level 6.
Reach Level 7.
Reach Level 8.
Reach Level 9.
Reach Level 10.
Reach Level 11.
Reach Level 12.
Reach Level 13.
Reach Level 14.
Reach Level 15.
Reach Level 16.
Reach Level 17.
Reach Level 18.
Reach Level 19.
Reach Level 20.
Reach Level 21.
Reach Level 22.
Reach Level 23.
Reach Level 24.
Reach Level 25.
Reach Level 26.
Reach Level 27.
Reach Level 28.
Reach Level 29.
Reach Level 30.