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