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