Here is the full list of all 24 12 Labours of Hercules VIII: How I Met Megara achievements.
Collect 100 resources of any kind\with Demeter's Obelisk!
Remove 4 obstacles using the 'Work Faster!' bonus!
Finish level in Expert Mode and Gold Time having 3 seconds left!
Complete all bonus levels in Gold time!
Find 5 puzzle pieces!
Find 5 or more hidden objects on a single level!
Activate the 'Run Faster!' bonus with a complete Hermes' Obelisk!
Beat a Developer's Record 3 times!
Beat a Developer's Record 20 times!
Collect resources 100 times or more from respawn points.
Earn every achievement!
Complete all levels in Gold time!
Complete the super-bonus level in Gold time!
Complete 20 levels in Gold time!
Collect 100 golds
Use 2 different bonuses together.
Call upon 5 characters
Use the same bonus again before its time runs out.
Call upon 3 different characters simultaneously.
Complete a level in Gold time without using any bonuses.
Workers must collect one resource after all the objectives are met.
Complete 5 levels in Gold time.
Build 3 obelisks on a single level.
Collect 5 more resources than the objective requires.