Here is the full list of all 29 Sneaky Sneaky achievements.
Kill 2 enemies at once with a bomb explosion.
Buy every shop item at least once.
Fully level up your stats.
Have 5000 Gold in your wallet.
Stay on 30 sand tiles with an enemy present.
Kill a Burrowing Skeleton with a bomb while its above ground.
Consume 10 health potions.
Complete the main campaign.
Collect every ruby.
Awarded for completing the City zone.
Sneak Kill an enemy who is searching for you.
Kill an Archer with your bow and arrow.
Finish a level without killing any enemies.
Awarded for completing the Canyon zone.
Anger a Ham Troll into destroying 3 or more objects.
Sneak Attack a sleeping enemy.
Survive an encounter after being detected 3 or more times.
Sneak Kill an enemy distracted by a jar.
Lead an enemy to 3 consecutive search points by breaking jars.
Sneak Kill 3 enemies while they are eating bait in a single level.
Feed a skeleton some bait.
Kill an enemy with a spike trap and switch.
Awarded for completing the Forest zone.
Successfully land 5 'Sneak Kills' from a bush or hay in a single level.
Destroy or Harvest 100 tiles. (Trees, Rocks, Barrels etc.)
Land a Long Shot with the bow.
Execute 5 consecutive Sneak Kills in a single level.
Finish a level without being detected. (Excludes tutorial level)
Collect your first ruby.