Here is the full list of all 52 Dawnsbury Days achievements.
Defeat puny kobolds.
Kill an enemy with a critical hit.
Defeat a kobold ambush.
Defeat the protectors of the abandoned temple.
Defeat the dark skeleton.
Retrieve the Golden Candelabra.
Save Morning Dewdrop from the elementals.
Defeat the protectors of the old manor.
Survive a dangerous night.
Defeat the dark shaman.
Open the gate with superior locks.
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.
Deal extra damage because of a creature's weakness
Kill three or more creatures using a single spell.
Cast a spell of 3rd level or higher.
Make a Strike with a +1 weapon.
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.
Enter a rage.
Score a critical hit on a roll where you have 100% crit chance.
Inflict positive damage on an undead with Heal.
Make an attack of opportunity.
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.