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