When Freedom Calls

When Freedom Calls is a quest and achievement/trophy in Fallout 4.

Quick walkthrough

 * 1) Take the laser musket (optional)
 * 2) Enter the Museum of Freedom
 * 3) Fight the raiders and locate the trapped people
 * 4) Talk to Preston Garvey
 * 5) Find a fusion core
 * 6) Find and activate the power armor.
 * 7) Get the minigun.
 * 8) Break the raider assault.
 * 9) Eliminate the remaining hostiles, and Deathclaw in Concord
 * 10) Report back to Preston
 * 11) Join Preston in Sanctuary Hills

Detailed walkthrough
On your travels through Concord, you spot a man protecting a group of people from Raider attacks on a balcony of a museum. Below the balcony is a short laser musket and some fusion cell ammunition in front of the doors. Pick it up if you’re interested in disintegrating your enemies, and clear any foes from the streets. Then enter the Museum of Freedom.

Fight your way through the raiders, and head upstairs. On the second floor, meet Preston Garvey and the remnants of his Minutemen forces. While you are here, be sure to pick up the Perception bobblehead and the RobCo Fun magazine, containing the Atomic Command holotape. Agree to help him and Sturges provide fire support to crush any remaining Raider opposition in town. Drop to the ground floor and into the basement. From here, you can choose to either hack the terminal to unlock the door, or directly pick the lock on the door. Both are of novice difficulty. Either way, once you have opened the door, grab the fusion core inside.

Once you have the fusion core, head upstairs and onto the roof to find a suit of T-45 power armor. Insert the fusion core into the power armor, and climb inside the suit. From here, you can take the minigun from the vertibird. You can either jump off the roof, or stay on it for a little while. Either way, start killing the enemies on the ground. When you kill Gristle, the only named raider, be sure to pick up the Corvega storage key off of his body. Once you have killed a considerable amount of raiders, a Deathclaw will appear. Although it looks menacing, it is relatively easy to defeat with both the minigun and the power armor. The deathclaw can do a lot of damage, however, so be cautious. Once you have defeated all of the enemies, enter the Museum of Freedom and speak to Preston to complete the quest.

Bugs
Quest sometimes cannot be redeemed after clearing town of hostiles. Fixed by console commad "SetStage MQ102 122"
 * Achievement does not unlock after Completing quest.