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.
Sneak Kill an enemy distracted by a jar.
Sneak Kill 3 enemies while they are eating bait in a single level.
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.
Sneak Kill an enemy who is searching for you.
Survive an encounter after being detected 3 or more times.
Awarded for completing the Forest zone.
Destroy or Harvest 100 tiles. (Trees, Rocks, Barrels etc.)
Execute 5 consecutive Sneak Kills in a single level.
Successfully land 5 'Sneak Kills' from a bush or hay in a single level.
Land a Long Shot with the bow.
Collect your first ruby.
Have 5000 Gold in your wallet.
Stay on 30 sand tiles with an enemy present.
Finish a level without being detected. (Excludes tutorial level)
Lead an enemy to 3 consecutive search points by breaking jars.
Kill 2 enemies at once with a bomb explosion.
Finish a level without killing any enemies.
Kill a Burrowing Skeleton with a bomb while its above ground.
Anger a Ham Troll into destroying 3 or more objects.
Sneak Attack a sleeping enemy.
Feed a skeleton some bait.
Buy every shop item at least once.