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