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