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