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