Here is the full list of all 15 Lord of the Click 2 achievements.
Complete the training
Complete level 1
Complete level 2
Complete level 3
Complete level 4
Complete level 5
Complete level 6
Complete level 7
Complete level 8
Complete level 9
Complete level 10
Summon an Archer
Summon an Omnik
Summon a Druid
Summon a Titan