Here is the full list of all 29 Sneaky Sneaky achievements.
Buy every shop item at least once.
Have 5000 Gold in your wallet.
Kill 2 enemies at once with a bomb explosion.
Stay on 30 sand tiles with an enemy present.
Complete the main campaign.
Fully level up your stats.
Collect every ruby.
Awarded for completing the City zone.
Sneak Attack a sleeping enemy.
Kill an Archer with your bow and arrow.
Awarded for completing the Canyon zone.
Kill an enemy with a spike trap and switch.
Consume 10 health potions.
Kill a Burrowing Skeleton with a bomb while its above ground.
Anger a Ham Troll into destroying 3 or more objects.
Lead an enemy to 3 consecutive search points by breaking jars.
Sneak Kill 3 enemies while they are eating bait in a single level.
Feed a skeleton some bait.
Land a Long Shot with the bow.
Execute 5 consecutive Sneak Kills in a single level.
Finish a level without killing any enemies.
Survive an encounter after being detected 3 or more times.
Destroy or Harvest 100 tiles. (Trees, Rocks, Barrels etc.)
Finish a level without being detected. (Excludes tutorial level)
Sneak Kill an enemy who is searching for you.
Sneak Kill an enemy distracted by a jar.
Awarded for completing the Forest zone.
Successfully land 5 'Sneak Kills' from a bush or hay in a single level.
Collect your first ruby.