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