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