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