Here is the full list of all 17 Spark Vs The Marshmallows achievements.
Be Bad at the Game 10 times.
Complete The Level "Digsite"
Complete The Level "Railroad"
Complete The Level "Disco Battle"
Complete The Level "Ninja Town"
Defeat The Thumper Boss!
Complete The Level "Chocolate Gates"
Complete The Level "Chocolate Caverns"
Complete The Level "Swings"
Defeat The Smore Cannon Boss!
Complete The Level "Tubes"
Defeat The Rocky Road Boss!
Unlock All Levels!
Collect 1000 Coins!
Complete and Don't Kill Any Marshmallows on the Level "Ninja Town"
Get a Perfect Score On the Level "Dance Battle"
Do The Konami Secret Code