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