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