Here is the full list of all 19 Rock of Ages achievements.
Win a War game using the Cube.
Win a match using the Snowball boulder.
Win 10 online War games.
Win a match without destroying any of your adversary's units.
Win a match with your gate unscathed.
Find all the keys scattered throughout the levels.
Get a gold medal on all maps in Time Trial mode.
Beat the game in Story mode.
Earn more than 7000 gold in one match.
Destroy a flying ship.
Destroy your adversary’s boulder.
Break off the second layer of your adversary’s boulder.
Land a projectile on some TNT to produce a shockwave combo that hits your enemy.
Score a direct hit on an enemy boulder with the Castlepult.
Hit the castle gate with the fireball powerup.
Win an online War game
Break off the first layer of your adversary’s boulder.
In SkeeBoulder, land your Boulder in the maximum multiplier.
Complete the tutorial level and escape from the underworld.