You could technically be invited by someone who has these unlocked and complete them that way, but you'll be completely ineffective due to your lower gear score, so they'll need to hard carry you through. The expeditions and tiers are as follows: To raise your CT, you must complete any expedition on your current highest tier (so completing any expedition on Tier 4 will unlock Tier 5, and so on). There are four new expeditions to complete for this achievement, and you will need to be at Challenge Tier 12 minimum to unlock them all, and their unlock tier is also the lowest tier you can play them on.

If you need damage healed/blocked you can increase the world tier so they do more damage to you. Put the difficulty to the lowest world tier and everything will die quickly if you need kills. At this point, enemies should continually spawn. Charge it about halfway and kill everything that has spawned, then charge it another quarter to about 75% and leave the charging area. You can get an unlimited spawn of enemies when charging the crystal during this mission. The best way to grind this out later on is using the Marsh Caverns Expedition. You can then kill large swarms of enemies with it later on by lowering the world tier. Use your skills any time the cooldown is up to maximize the chance of completing the accolades. I found the Technomancer's Pain Launcher for instance to really be underpowered, and moved away from it as I increased the world tiers. The only reason I suggest this is that some skills can't really get kills on their own. I would suggest sticking with whatever skills you enjoy the most during the story, rather than sticking with the first unlocks until you master all the tiers, then swapping them out for a new skill. You can check what your class requires in the accolades tab of the menu.

The requirements are varied depending on the class you choose, but generally they involve getting kills, inflicting status effects, healing or blocking damage, etc. This achievement requires that you complete all five tiers of all the different accolades in the class portion of the accolades tab. Nothing is too hidden, but take a walk around each area after clearing out enemies to get everything.

Ore/Journals: Watch for blue glows around the maps as you play through the story and quests, these will either be ore deposits to mine or journal pages to pick up.

Loot: You will want to sell all common (white) and uncommon (green) loot for cash and working toward 300 sales, while you should always break down rare (blue), epic (purple), and legendary (yellow) loot to get crafting materials and mods.

Don't worry about these, they can all be done in Expeditions quickly.

Combat Achievements: There are a number of achievements (and in-game accolades) for doing various things in combat.

I'd suggesting doing them all as they become available.

Side-Quests: None are missable and can be done after the story, but doing them as you go will offer more loot, XP, and kills toward your accolades.

I'd highly suggest increasing the world tiers throughout the entire story to get more loot to dismantle for mods, more money and crafting materials, etc. Once you increase the world tier, you will encounter harder enemies but receive better loot in exchange.

World Tiers: As you play the game, experience will go toward your character to level up and toward whatever world tier you are playing on, which affects the difficulty of the enemies.

As you go through the story, keep the followng in mind: There are a number of things you can keep in mind as play, but focus on completing the story to open up the Expeditions where the 'end game' will take place. Nothing in the game is missable, and you can technically play the entire thing on the lowest difficulty setting, but I would suggest increasing the difficulty as you go.(more on that below). Your main goal should be to first complete the main story. Combining intense gunplay with violent powers and an arsenal of increasingly twisted weaponry and gear-sets, OUTRIDERS offers countless hours of gameplay from one of the finest shooter developers in the industry – People Can Fly. With rich storytelling spanning a diverse world, you’ll leave behind the slums and shanty towns of the First City and traverse forests, mountains and desert in the pursuit of a mysterious signal. As mankind bleeds out in the trenches of Enoch, you’ll create your own Outrider and embark on a journey across the hostile planet. OUTRIDERS is a 1-3 player co-op RPG shooter set in an original, dark and desperate sci-fi universe.

Outriders map