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