As soon as you enter the cemetery but before talking to Jimmy, check the planter behind the statue to find a relic. You can still get his after talking to Jimmy and after Bragg appears but you must do so before going upstairs and pursuing him.
Talk to Jimmy and land a few shots at Bragg. Kill his reinforcements then pursue him. Kill more enemies and he'll make another appearance. Make sure to take out the light posts as well.
One tough guy
This is pretty much straightforward so just keep following the path until you reach the part where you need to destroy a generator in order to push forward.
Keep heading straight until you reach mausoleum. Check the back of the building to find another relic.
Keep fighting forth until you reach a talent shrine. Reset your points if you want and concentrate on a specific skill tree so you can access the highest talent. When ready, continue forth for a boss battle.
You'll be in a real showdown against the bastard, Bragg. He will teleport from place to place while lobbing projectiles at you or shoot you. He will also appear in the battlefield and attack you from behind or just simply charge towards you.
Keep moving. If he's shooting from a distance, zoom in and fire back with your weapons. If he floats in mid-air, anticipate that he's going to charge. Evading this charge successfully will leave him open from behind so just slash away with your right demon arm. His minions will also appear, providing much needed nourishment to restore your health. They'll only come in 2-3 waves so don't rely on them to get healed.
Dish best served cold