Here is the full list of all 28 Grave Danger achievements.
Defeat 100 Enemies
Malice's special badge for Dante
Find some delicious hidden meat in a wall!
Achieve S Rank in 3 Levels
Eat 25 Slices of Bacon
Eat 25 Gumdrops
Eat 25 Cans of Beans
Eat 25 Pork Chops
Eat 25 Loafs of Bread
Eat 25 Cheese Wheels
Eat 25 Beats
Drink 25 Cactus Juices
Drink 25 Pots of Coffee
Eat 25 Herbs
Eat 25 Skewered Lizards
Drink 25 Health Potions
Collect 25 Mortar & Pestles
Eat 25 Muffins
Drink 25 Jugs of Juice
Defeat 30 Bats
Defeat 30 Orc Minions
Defeat 30 Candy Robots
Achieve S Rank in 10 Levels
Achieve S Rank in 20 Levels
Achieve S+ Rank in 3 Levels
Achieve S+ Rank in 10 Levels
Achieve S+ Rank in 20 Levels
Collect all unique WANTED: Dead AND Alive posters