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