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