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