Here is the full list of all 12 Mutant Storm: Reloaded achievements.
Get the multiplier to x2
Get the difficulty to Yellow Belt
Get the difficulty to Orange Belt
Get the difficulty to Green Belt
Get the difficulty to Purple Belt
Get the difficulty to Blue Belt
Get the difficulty to Brown Belt
Get the difficulty to Black Belt
Complete all 89 levels in Adventure Mode
Complete all 89 levels in Tally Mode
Get the multiplier to x4
Complete all 89 levels in Adventure Mode on Black Belt starting from level 1.