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