Here is the full list of all 50 Shovel Knight Dig achievements.
Finish a level and swing the Shovel Blade fewer than 3 times, including digging.
Defeat Hive Knight without hitting Fleck.
Retrieve a money bag using the Reverse Exa.
Emerge unscathed from a battle with any Hexcavator.
Defeat 5 foes at once using the War Horn.
Freeze Dozedrake with the Blizzeo Wand.
Clean off a Mud-Encrusted Relic without using it.
Have two different follow pets at one time!
Earn every Shovel Blade technique from Master Argus.
Help Altius in three locations in the Mushroom Mines.
Hit Master Argus with a surprise attack.
Deflect a Throwing Trowel to defeat 3 enemies.
Descend 50 blocks in a Coffer of Safekeeping.
Electrocute 3 enemies at once.
Post a score on the Leaderboard.
Finish a world without eating any food.
Finish the game.
Finish the game without spending any gems.
Acquire a new set of armor.
Hatch 5 creatures from eggs.
Spend a combined total of 20000 gems in the shops at the surface.
Finish off Spore Knight with her own hat.
Discover 20 secret rooms along the well's sides.
Use the Gusteo Wand to push an enemy into a hazard.
Defeat 12 enemies in a row using the Shovel Drop without touching the ground.
Choose 5 risky paths at the bottom of the well.
Collect all 9 cogs in a world.
Open the Drill Capsule 10 times.
Wield 5 relics
Find all the secrets in one world.
Dig through the Mushroom Mines.
Defeat an enemy with the Flameo Wand from more than 8 blocks away.
Finish any stage without taking damage.
Defeat an enemy as Tiny Shovel Knight.
Buy your first item.
Complete the tutorial
Have 20000 gems on hand.
Run over 5 enemies using the Mobile Gear Drill in one go.
Defeat a boss with a level 5 Morph Lance.
Defeat 2 enemies with one cast of the Shadow Locket.
Absorb 3 hits using the Bubble Frog.
Defeat 3 enemies using the Rising Dagger without hitting the ground
Don't collect any gems in one stage.
Use a glass key acquired from a previous world in a new world.
Beat the game without using any relics.
Beat the game within 25 minutes.
Purchase or unlock all relics, armors, and accessories.
Defeat an enemy using 5 different relics.
Finish the game having seen every world in one run.
Disable the Omega Saw.