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