Borderlands: Game of the Year Edition

Story related, can't be missed

Missions involved in this trophy:

• Sledge: Meet Shep.
• Sledge: The Mine Key.
• Sledge: Battle For The Badlands.

For this trophy we strongly recommend you bring a rapid fire Sniper Rifle, a decent shock Shotgun, a Helix Rocket Launcher and an incendiary Contact Grenade Mod. Do not attempt this mission without a shock weapon of some kind. By now you should have a decent shield but if not, keep looking until you find one.

The Mine is full of enemies, some of which are equipped with elemental weapons, so watch out! Fortunately there are two Vending machines in the hut opposite where you start the area so you can stock up if needed and there’s also two just before you fight Sledge. The gate to the main complex is locked and you can either unlock it now and head straight for the stairs or take the stairs to your right and make your way through the buildings there. We recommend taking the stairs to to the right.

Once you're outside again you will face more enemies and a manned Minigun Turret on the stairs diagonally opposite you. Fortunately for you there is plenty of cover so you can clear out the enemies and take out the Turret without taking too much damage. The easiest way to take out the Turret Gunner is to destroy the Turret itself, which is where the Rocket Launcher comes in handy. Once you've cleared out the area, make your way through the cave that's at the top of the stairs and to the right. This next section is where your Shotgun will come into its own as there are a lot of enemies in this area that like to get too close for comfort. There is some high ground in the form of an old mining railway that we highly recommend you use, as enemies rarely go up there. Once you get up high, crouch and start picking off the enemies with your Sniper Rifle and after you've killed them all you can jump down and make your way to where the Waypoint is pointing.

This is where things get tricky as you now have to face Sledge and his bandits. To take them out you will need that shock weapon we told you to bring as his shields are way stronger then anything you have and normal weapons won't even dent it. As soon as Sledge's intro cutscene ends, unleash an entire magazine into his shield then get your Rocket Launcher and grenades out and let him have it. Also, take some pot-shots at the bandits. Now he will try and kill you with his own Shotgun (or his Hammer if you get too close) so quickly run to the other end of the room and continue firing at him. Whilst Sledge is taking damage his shield will not recover, so use this to your advantage but retreat from the area via one of the side doors, reload your weapons and restock on ammo and health if necessary. Once you get the strategy down you should be able to take Sledge out in a few minutes. After Sledge is dead, pick up his Unique Shotgun then go to the Chest he was guarding and retrieve the Eridian Artifact. To Turn In this quest, return to Dr. Zed in Fyrestone.

Here's another method courtesy of JHChiBulls:

With Sledge, I led him to the door you enter for the fight and I was standing in the doorway and kept shooting and he didn't hit me once.