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