Here is the full list of all 50 Overfall achievements.
Destroy the first 3 Vorn ships that just came out from the portal.
Beat the game without upgrading your utility or weapon skills.
Beat the game without using a mobility skill.
Visit every single inn on the map.
Recruit Pyromancer and Ice Maiden to the same party.
Beat the game with every class.
Meet the Orc Warchief as an ally.
Become Exalted with all races.
Unlock all classes.
Meet the Goblin Freeman as an ally.
Meet the Forsaken Redeemer as an ally.
Die with Retaliation or Bone Pore's damage.
Meet the Dwarf Tradelord as an ally.
Beat the game without buying food from bazaars, inns or trade-boats.
Beat the game without using Dust's speed boost.
Meet the Hollow Alpha as an ally.
Beat the game.
Meet Ezel.
Meet the Elf Queen as an ally.
Upgrade a utility skill.
Kill the Vorn King.
Upgrade a weapon part.
Collect 1000 runes.
Spend 4000 foods.
Bank 100 dusts in a single playthrough.
Win 1000 battles.
Kill 700 Everguards.
Kill 500 Undeads.
Kill 20 Jarls.
Kill the Vorn King 10 times.
Take 1000 quests.
Unlock all class trinkets.
Unlock all neutral trinkets.
Unlock all weapons.
Unlock all utility skills.
Unlock all companions.
Unlock everything.
Visit every single island on the map.
Acquire every persona in the game.
Play with every possible hero combination.
Kill the Everking with your last surviving party member.
Win a battle with the last surviving party member and 1 HP.
Recruit 10 companions in a single playthrough.
Resurrect an ally at Altar 7 times in a single playthrough.
Hit a critical strike while applied with Blind and Chilled.
Kill the Vorn King with Hidden buff on you.
Reach the Citadel without a companion.
Kill all 6 troll types.
Kill all enemy classes. (except Vorn King and Everking)
Maintain a party with 3 greathammer wielders.