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