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