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