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