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