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