Here is the full list of all 16 Super Stereotypical: The Rise of Indiemania achievements.
Start the game.
Beat stage 3 on easy.
Beat stage 4 on easy.
Beat stage 5 on easy.
Beat stage 6 on easy.
Beat stage 7 on easy.
Beat stage 3 on normal!
Beat stage 4 on normal!
Beat stage 5 on normal!
Beat stage 6 on normal!
Beat stage 7 on normal!
Beat Crystal Golem on hard!
Beat Spore Queen on hard!
Beat Carl on hard!
Beat Wisp Lord on hard!
Beat Evil Nerd on hard!