Here is the full list of all 13 Adventures of Shuggy achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Complete all the Teleporting Troubles levels.
Complete "Extending Platform" without using the rope.
Complete "In One Way..." in less than 16 seconds.
Defeat the guardian of the clocktower.
Complete all of the clocktower levels.
Complete all of the graveyard levels.
Complete "Spike Dodging" without using the teleporter.
Complete all of the gallery levels.
Complete all of the dungeon levels.
Complete all of the boiler room levels.
Complete a level containing Shmu.
Complete a time travel level.
Complete all the CoOp levels.