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