Here is the full list of all 52 Dawnsbury Days achievements.
Deal at least 50 damage to a single creature with a single combat action.
Win all encounters in the "Additional scenarios" encounter group. You don't need to win the "Training Grounds" encounter.
Win all encounters of the main adventure path on Insane difficulty.
Win all encounters of the main adventure path on Hard difficulty or above.
Score a hit 10 times because of +1 circumstance or status bonus.
Activate a blood magic effect.
Score a critical hit on a roll where you have 100% crit chance.
Cause an enemy creature to suffer from 3 different debuffs at the same time.
Command an animal companion.
Enter a rage.
Have all four heroes be Undetected at the same time.
Win the whole adventure path without ever buying an item from the shop (not even during character creation).
Kill three or more creatures using a single spell.
Make a Spellstrike.
Unleash your psyche.
Perform a flurry of blows.
Grapple an enemy creature.
Re-engage your kinetic aura mid-combat.
Win an encounter with four characters of the same class.
Win an encounter without casting spells or making Strikes.
Double-kill the demon lord and save Dawnsbury.
Clear the skies of Dawnsbury.
Defeat the remaining dark poets.
Cast a spell of 3rd level or higher.
Protect merfolk children from an attack.
Defeat 80 enemy creatures.
Survive an ambush on the open seas.
Protect and retrieve the prismatic key.
Defeat the demon in the town sewers.
Protect the Golden Candelabra.
Protect the walls of Dawnsbury.
Defeat the squad that teleported in.
Save Morning Dewdrop's sister.
Open the gate with superior locks.
Defeat the dark shaman.
Survive a dangerous night.
Defeat the protectors of the old manor.
Save Morning Dewdrop from the elementals.
Retrieve the Golden Candelabra.
Have 3 buffs on a single hero at the same time.
Defeat the dark skeleton.
Inflict positive damage on an undead with Heal.
Deal extra damage because of a creature's weakness
Defeat the protectors of the abandoned temple.
Kill an enemy with a critical hit.
Defeat a kobold ambush.
Drain bonded item to regain a spell slot.
Inflict sneak attack damage.
Make an attack of opportunity.
Make a Strike with a +1 weapon.
Make a Strike with a +1 striking weapon.
Defeat puny kobolds.