Here is the full list of all 17 Mobmania achievements.
Wing a game with the Jester trinket equipped.
Complete the tutorial.
Defeat Ninja.
Defeat 10000 Mobs.
Win on one character.
Defeat 5000 Mobs.
Defeat 2500 Mobs.
Defeat 1000 Mobs.
Defeat 100 Mobs.
Play a game.
Defeat Witch.
Defeat 50000 Mobs.
Win on five characters.
Win on ten characters.
Complete a daily challenge.