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