Here is the full list of all 40 The Vagrant achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Clear the game in Hard difficulty
Unlock all achievements
Failed to defeat Shroom prime
Failed to stop Soulreaper
Failed to defeat Santiago
Acquire a weapon or armour with 4 runestones
Failed to defeat Kumasith
Defeat Soulreaper
Achieve true ending
Unlock all entries in Monsterpedia
Slay the chicken
Achieve normal ending
Unlock all entries in Note
Acquire Sword of verum
Collect 1000000 mana
Acquire all skills
Unlock all abilities
Collect 1000000 gold
Acquire all recipes
Explore all areas
Defeat Fallen Kumasith
Consumed 100 potions in total
Defeat Valerie
Achieve 999 combos
Achieve 500 combos
Defeat Shroom prime
Achieve 100 combos
Defeat Ground shaker
Stop Soulreaper
Slay 666 monsters
Keep drinking potions
Defeat Santiago
Defeat Headless horseman
Defeat Kumasith
Defeat Maximillian II
Defeat HMWV
Acquire a max ranked weapon or armour
Defeat Esgonian general
Fight Soulreaper
Acquire an onion from the chef in Brocley village