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