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