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