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