Here is the full list of all 29 icosi-do achievements.
Read the whole tutorial.
Set the music instrument to harp.
In the level menu, open the level history.
Start a new game by entering a level code.
Complete levels 1 to 4.
Complete levels 1 to 9.
Complete levels 1 to 14.
Complete levels 1 to 19.
Complete levels 1 to 24.
Complete levels 1 to 29.
Complete levels 1 to 34.
Complete levels 1 to 39.
Complete levels 1 to 44.
Complete levels 1 to 49.
Complete levels 1 to 54.
Complete levels 1 to 58.
Complete level 1* with colors off and move limit on.
Complete level 5+ in game starting from level 1+ with move limit.
Complete level 10+ in game starting from level 1+ with move limit.
Complete level 15+ in game starting from level 1+ with move limit.
Complete level 20+ in game starting from level 1+ with move limit.
Complete level 25+ in game starting from level 1+ with move limit.
Complete level 30+ in game starting from level 1+ with move limit.
Complete level 35+ in game starting from level 1+ with move limit.
Complete level 40+ in game starting from level 1+ with move limit.
Complete level 45+ in game starting from level 1+ with move limit.
Complete level 50+ in game starting from level 1+ with move limit.
Complete level 55+ in game starting from level 1+ with move limit.
Complete level 59+ in game starting from level 1+ with move limit.