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