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.
Anger a Ham Troll into destroying 3 or more objects.
Buy every shop item at least once.
Finish a level without killing any enemies.
Sneak Attack a sleeping enemy.
Lead an enemy to 3 consecutive search points by breaking jars.
Survive an encounter after being detected 3 or more times.
Stay on 30 sand tiles with an enemy present.
Sneak Kill 3 enemies while they are eating bait in a single level.
Feed a skeleton some bait.
Collect every ruby.
Fully level up your stats.
Finish a level without being detected. (Excludes tutorial 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.
Sneak Kill an enemy distracted by a jar.
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.
Execute 5 consecutive Sneak Kills in a single level.
Successfully land 5 'Sneak Kills' from a bush or hay in a single level.
Collect your first ruby.