Here is the full list of all 11 RollerBaller achievements.
Collect 100 Coins
Collect 200 coins
Collect 500 coins
Unlock USSR skin and Ushanka accessory
Unlock the Hussar hat, and the plunger accessory
Complete the Shimazu Castle, unlock The Fish Accessory and the Top Hat
Unlock all Slav Skins
Get 10 stars
Get 30 stars
Get a win on all multiplayer maps
Get a win on all multiplayer maps in hard mode