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