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