Here is the full list of all 23 12 Labours of Hercules V: Kids of Hellas (Platinum Edition) achievements.
Complete 20 levels in Gold time!
Collect 100 golds
Build 3 obelisks on a single level
Find 5 or more hidden objects on a single level!
Use 2 different bonuses together.
Remove 4 obstacles using the "Work Faster"!
Collect 100 resources of any kind with Demeter's Obelisk!
Call upon 5 characters.
Complete a level in Gold time without using any bonuses
Workers must collect one resource after all the objectives are met
Beat a Developer's Record!
Find 5 puzzle pieces!
Bonus extended
Complete 3 levels in Gold time.
Call upon 3 different characters simultaneously
Prevent thief from stealing resources during a single level!
Complete four bonus levels in Gold time!
Activate the 'Run Faster!
Beat a Developer's Record 10 times
Outsmart a thief by stealing something from him - right from under his nose!
Earn every achievement!
Complete all levels in Gold time!
Complete the super-bonus level in Gold time!