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