Here is the full list of all 52 Dawnsbury Days achievements.
Have all four heroes be Undetected at the same time.
Win all encounters in the "Additional scenarios" encounter group. You don't need to win the "Training Grounds" encounter.
Win an encounter with four characters of the same class.
Kill three or more creatures using a single spell.
Deal at least 50 damage to a single creature with a single combat action.
Enter a rage.
Command an animal companion.
Have 3 buffs on a single hero at the same time.
Cast a spell of 3rd level or higher.
Cause an enemy creature to suffer from 3 different debuffs at the same time.
Double-kill the demon lord and save Dawnsbury.
Clear the skies of Dawnsbury.
Defeat the remaining dark poets.
Protect merfolk children from an attack.
Survive an ambush on the open seas.
Defeat 80 enemy creatures.
Protect and retrieve the prismatic key.
Defeat the demon in the town sewers.
Make a Strike with a +1 striking weapon.
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.
Make a Strike with a +1 weapon.
Defeat the dark skeleton.
Activate a blood magic effect.
Inflict positive damage on an undead with Heal.
Deal extra damage because of a creature's weakness
Defeat the protectors of the abandoned temple.
Defeat a kobold ambush.
Kill an enemy with a critical hit.
Make an attack of opportunity.
Defeat puny kobolds.
Inflict sneak attack damage.
Win all encounters of the main adventure path on Hard difficulty or above.
Win all encounters of the main adventure path on Insane difficulty.
Score a hit 10 times because of +1 circumstance or status bonus.
Grapple an enemy creature.
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).
Score a critical hit on a roll where you have 100% crit chance.
Drain bonded item to regain a spell slot.
Re-engage your kinetic aura mid-combat.
Unleash your psyche.
Make a Spellstrike.
Perform a flurry of blows.