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