Here is the full list of all 12 Ukrainian Ninja achievements.
Complete World 1 Townstead - In Single Player
Complete World 2 Trainride - In Single Player
Complete World 3 The City - In Single Player
Complete World 4 The Sewers - In Single Player
Complete World 5 Hidden Forrest - In Single Player
Complete World 6 Convoy - In Single Player
Complete World 7 Chemical Factory - In Single Player
Complete World 8 Return to City - In Single Player
Collect the Special Coins in all Worlds - In Single Player
Complete All Stunts in all Worlds - In Single Player
Perfect Score on all Bonus Rounds in a Single World - In Single Player
Perfect Score all Bonus Rounds in all Worlds - In Single Player