Here is the full list of all 15 Restless Hero achievements.
COLLECT 10 GOLD INGOTS.
FINISH 5 LEVELS.
GET 5 MEDALS.
COLLECT 25 GOLD INGOTS.
COLLECT 50 GOLD INGOTS.
DESTROY 25 ENEMIES.
DESTROY 55 ENEMIES.
DESTROY 100 ENEMIES.
FINISH 15 LEVELS.
FINISH 30 LEVELS.
GET 15 MEDALS.
GET 25 MEDALS.
UPGRADE 3 POWERS.
UPGRADE 5 POWERS.
UPGRADE 10 POWERS.