Here is the full list of all 29 Sneaky Sneaky achievements.
Survive an encounter after being detected 3 or more times.
Kill a Burrowing Skeleton with a bomb while its above ground.
Kill 2 enemies at once with a bomb explosion.
Lead an enemy to 3 consecutive search points by breaking jars.
Anger a Ham Troll into destroying 3 or more objects.
Buy every shop item at least once.
Consume 10 health potions.
Complete the main campaign.
Fully level up your stats.
Collect every ruby.
Awarded for completing the City zone.
Sneak Attack a sleeping enemy.
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.
Feed a skeleton some bait.
Stay on 30 sand tiles with an enemy present.
Finish a level without killing any enemies.
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.)
Successfully land 5 'Sneak Kills' from a bush or hay in a single level.
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.
Sneak Kill 3 enemies while they are eating bait in a single level.
Collect your first ruby.