Here is the full list of all 23 Keep the Keep achievements.
You have succesfully completed all levels of the main campaign
You have won your first multiplayer match!
You have won 10 multiplayer games!
You have won 100 multiplayer matches!
You have completed the Cannon chapter!
You have completed the Bow chapter!
You have completed the Shield chapter!
You have completed the Barracks chapter!
You have completed the Catapult chapter!
You have completed the Sapper chapter!
You have completed the Builder chapter!
You have completed the Repair chapter!
You have completed the Thunder chapter!
You have completed the Domain chapter!
You have completed the Defender chapter!
You have completed the Golem chapter!