Final Fantasy XV has a ton of side quests for you to complete. Like in any other games, you only have the option whether to take them or not. Completing them however does give you a rewards. Some side quests could be difficult, some are manageable. Here's a guide on how to complete all 15 side quests in Final Fantasy XV.
Final Fantasy XV - Chapter 1 Side Quests
The Pauper Prince. Interacting with the man at the weapon shop will have your allies tell that you're penniless. Ask Cindy for a loan so she'll give you the quest and a bit of cash. During the quest, take down even the low level foes using the two-handed sword.
Hunter Becomes The Hunted. Enemies will come by surprise as you go on your first way point. Clear those out until the next point to view the cut scene. You get another Magic Flask for this.
The Mutant Maraudar. You'll chase a monster that Dave's been hunting. This level 2 monster isn't resilient to fire but has great HP. Use the flask when hitting to lower down its HP to half.
The Highway Helper. Northwest on the road of Hammerhead, you'll find a guy who needs a repair kit. Get one from the shop attendant in the gas station. You might need a couple of them as a few people needs them along the way. You'll get 300 XP and 500 gil here.
Gone Hunting. At the Longwythe Rest Area, you'll need search for the boss of the hunters. He's at a shed beside the diner. Talk to the guy inside to know where the dog tag is. You'll receive 500 XP and 10 hi-potion here.
Search and Rescue. You can find a man sitting on the rocks right at the intersection of Hammerhead and The Three Valleys. Use the potion to complete this quest.
Dust to Dust. Second in Dave's dog tag quest, go to the marker in Prarie Outpost and take enemies out. Find the dog tag near the car. You'll get 600 XP and 5 mega-potion here.
Unlucky Driver. Down the road of Longwythe Peak, another man needs a repair kit.
Broken Down. South on the road of Longwythe Rest Area, you'll need to help a man whose car has broken down. You'll receive 300 XP and 500 gil here.
Kitty Catering. Meet Galdin first, to unlock this quest. At the quay, interact with the cat that appears. You'' need to catch a fish, cook it and feed the cat. You'll receive 600 XP and dragon scales here.
Final Fantasy XV - Chapter 2 Side Quests
Cid Sophiar, Master Mechanic. You'll get 500 XP and Drain Lance II here. Upgrade the Drain Lance you get from the quest. You'll need a metal bit to do so.
Scenic Delivery. Takka needs a Lucian tomato. Buy one from the Prairie Outpost. He'll reward you with 2 Gighee ham, 2 Leiden potato, 2 sheep milk and 2 funguar on top of 300 XP.
The Aspiring Artisan. Go to Galdin Quay to speak with Dino. Proceed to the quest marker and search for a shiny red item against a huge rock. You'll earn 500 XP and amethyst bracelet here.
Hunters and Gathers. A Takka quest, get Daggerquill Breast by killing birds in the area. You'll get 500 XP, 2 Cleigne wheat, 5 Dualhorn steak and 5 Leiden pepper.
Emergency Delivery. You'll need to take down a gargantuan Garula along with little ones right outside the sepulcher with all the soldiers. The beast requires level 11 so you need Cor. Once killed, you'll gain 1,000 XP, 5 Cleigne wheat, 5 killer tomato and 5 Saxham Rice.
A Better Engine Blade. You'll need to upgrade the sword you have. Cid needs a rusted bit which you'll get alongside metal bit.
The Ever Regal Regalia. Find the aero wax at the tunnel going to the center. As you get out, you'll meet an injured guy. Heal him using a potion for XP and gil. You'll earn 150 XP.
Final Fantasy XV - Chapter 3 Side Quests
The Professor's Protégé. At Coernix Station in Alstor, go to the quest marker. Talk to the woman at the table, then find some croaks. You can find beside the rocks, in the lake and near bushes. You'll get 3,000 XP and a star pendant.
Final Resting Plains. Take down opponents at Coernix Station. You'll get 800 XP and 10 elixir here.
Fishing Buddies. At the fishing spot in Duscae, find the Bomber: Ice Bomb lure near a man and use it to catch the fish. After catching Crag Barramundi, look for the yellow fish.
The Ever Gleaming Regalia. At the marker, find the regalia near the broken down car. Go back to Cindy to upgrade your regalia. You'll get 1,000 XP here.
Where The Wild Chocobos Are. After unlocking the Chocobos, find the wild ones at Wiz Chocobo Post. Go back to where the Behemoth and capture to photo with it. You'll earn 500 XP, xelphatol apple seeds, doman plum pits and mamook pear seeds here.
Bird on the Brink. Find a wounded Chocobo in the wild and heal it with a potion. Proceed to the way point and the return to the wiz. You'll get 1,000 XP here.
A Feathery Feast. Bring Wiz an Aegir Root. If you don't have it, go back to the first area on the road going to Galdin.
Chase That Chocobo. Proceed to the last area and interact with the Chocobo. Take down foes and heal the Chocobo. You'll get 3,000 XP and new Choco colors.
Pilgrimage. At Wiz Chocobo Post, check out a site near it. Beat down the empire there and you'll get 500 XP.
Scraps of Mystery VIII. At Cauthess Rest Area, you'll find this in the open hanger. Head to the downed ship and you'll find on the side a gold shiny item. Pick that up for a new map fragment to be unlocked.
A Rocky End. A Dave quest at Cauthess Rest Area, search for the enemies and beat them. Look for the tag behind the huge rock.
Final Fantasy 15 is now available on Xbox One and PlayStation 4.