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