Here is the full list of all 50 Shovel Knight Dig achievements.
Defeat Hive Knight without hitting Fleck.
Finish a world without eating any food.
Electrocute 3 enemies at once.
Clean off a Mud-Encrusted Relic without using it.
Defeat an enemy with the Flameo Wand from more than 8 blocks away.
Hatch 5 creatures from eggs.
Help Altius in three locations in the Mushroom Mines.
Spend a combined total of 20000 gems in the shops at the surface.
Finish the game.
Finish the game without spending any gems.
Have two different follow pets at one time!
Acquire a new set of armor.
Emerge unscathed from a battle with any Hexcavator.
Defeat 5 foes at once using the War Horn.
Discover 20 secret rooms along the well's sides.
Finish any stage without taking damage.
Open the Drill Capsule 10 times.
Wield 5 relics
Collect all 9 cogs in a world.
Choose 5 risky paths at the bottom of the well.
Find all the secrets in one world.
Dig through the Mushroom Mines.
Finish off Spore Knight with her own hat.
Defeat an enemy as Tiny Shovel Knight.
Post a score on the Leaderboard.
Defeat 12 enemies in a row using the Shovel Drop without touching the ground.
Complete the tutorial
Buy your first item.
Have 20000 gems on hand.
Earn every Shovel Blade technique from Master Argus.
Run over 5 enemies using the Mobile Gear Drill in one go.
Descend 50 blocks in a Coffer of Safekeeping.
Defeat a boss with a level 5 Morph Lance.
Freeze Dozedrake with the Blizzeo Wand.
Use the Gusteo Wand to push an enemy into a hazard.
Deflect a Throwing Trowel to defeat 3 enemies.
Retrieve a money bag using the Reverse Exa.
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.
Finish a level and swing the Shovel Blade fewer than 3 times, including digging.
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.
Hit Master Argus with a surprise attack.