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