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