Obtained by completing the tutorial

Gets unlocked with equipping the first module part

Activate the first Daoka close to Emea

Neutralize the first outpost

Neutralize the first base. (Marked with a skull icon on map)

Destroy the first drill, which will probably be the one close to Bidaa

Obtain the second weapon during a base raid

Receive Oru's gun from Maar in the museum in Prokriana

At one point in the game you will have to fight a Garondar worm

At one point of the game, in Prokriana, you will automatically fight against Jack Boerum

You have collected all four codices of each temple. These are needed to help the lost spirits in the daroshams in Palana. This is part of the main quest in order to get its daromon.

At the beginning of the third act you will have to defeat an officer

Received in third act after connecting with Cutter Slade's daughter

Received in third act on defeating every soldier on the orbital station

Unlocked by obtaining Emea's Daromon

Unlocked by obtaining Bidaa's Daromon

Unlocked by obtaining Sappa's Daromon

Unlocked by obtaining Prokriana's Daromon

Unlocked by obtaining Palana's Daromon

Unlocked by obtaining Desan's Daromon

Unlocked by obtaining Kizaar's Daromon

You have collected all 7 Daromons. Not all quests need to be fulfilled (green checkmark) or done 100% (Ulukai symbol in quest tree) for receiving the daromon.

Finish the game

Destroy 500 Droids. Clean the outposts and bases and you will reach this number easily.

Revert/Shoot 200 creatures on adelpha (don’t if they don’t attack - save wildlife!). Easily achieved with cleaning gork eruptions. This includes sannegtas(fish), all kinds of kamenais(birds), krakits(ground bugs), all kinds of gamors(tigerlike quadpets), Nakbee (flying bugs), zeedogs (long-neck-hiding-super-scary-loud-noise-making-water creatures)

Spend 5000 nano cells (pink collectibles) - used for upgrading the shield / second upgrading tree, unlocking module spots for the weapon and upgrading modules. you can find them in chests cluttered along the bases and outposts or receive some through finishing quests.

Activate all 25 daokas in Adelpha. See this guide: All Daoka locations

Clean the first gork eruption (icon on the in-game map is the same as in the achievement). All necessary goals of one site are being displayed once you get close to the area

Clear all 43 gork eruptions

Clean all 30 outposts. An outpost is marked grey on the map when all enemies have been destroyed. Outposts are marked by the icon of three rings.

Neutralize all 14 bases. Marked on the in-game map with a skull icon surrounded by a hexagon. Some are necessary to clear during the story - some are optional

Open the first orym chest. Around Adelpha you can find glowing big plants (also marked with an icon as shown on the achievement) Follow the appearing orym path and reach the final orym flower (use it to open).

Open all 50 orym chests

Open an essence shrine. Marked on the in-game map with the same symbol as in the achievement. On opening a red essence sphere appears - follow it until you can enter the shrine.

Complete all 20 essence shrines

Destroy all three drills. While destroying the first drilling machine is mandatory, getting rid of the other two is optional. You will come across them along the story quests, though.

Achieved by using each village power once (using all four upgrades to orus gun, call the galenta, die once and get automatically revived by Almayel)

Use this guide: Collect all 32 Module Parts

Unlock every additional module slot for the pistol and the rifle

Upgraders (not merchants) in each village sell upgrades - buy all 21. Note that some of these upgrades (level 3) can ONLY be bought from the upgrader in Desan

Unlock every skill in both trees; total of 32

Collect all diary pages. Before jumping to the guide below try to find them yourself. If you hover over the locked diary entries you get hints where they are on the right side.
Use this guide: Collect all Anatok's Diary Pages; In an earlier version of the game (also played in the guide) you only had to collect 31 of 32 pages - one page was bugged; since the last patch every page should be collectible.

In each village buy the recipes from the merchants (not sellers)

Collect all inventory items once. I achieved this while hunting all secondary quests.
Cute little list (thanks for typing those Lanani!):
Consumables:
Green helidium, Red helidium, Eluee plant, Eluee Potion, Greater Eluee Potion, Fae plant, Fae potion, Greater Fae potion, Gandha plant, Gandha potion, Greater Gandha potion, Ka plant, Ka potion, Greater Ka potion, Ascior beacon, Garondar beacon, Ventilope beacon, Essence vine beacon, Galenta call, Regeneration Boota, Aura Boota, Greater Aura Boota

Resource:
Nano cells, Macro cells, Blue Helidium, White Helidium (from the main quest in Bidaa), Zorkins, kamenai talon, nakbee stinger, zeedog sap, krakit gland, krakit egg, gamor meat, dro-kamenai pelt, dro-krakit mandible, dro-krakit egg, dro-gamor teeth, dro-zeedog skin, black algae, golden mushroom, uncommon flower (red), uncommon flower (blue), meptar, boogots, dark helidium, talan statuette, ancient statuette, ventilope statuette, sai statuette, gork, resin, shiny fish, precious stone, fossil

Key items:
the 21 upgrades from the upgrader NPCs, the 4 kodexes from the temple, the 6 scrolls for kureg, the daromon of each village, Ascior larvae, lampe pistils, mileorat, morag, nom-nom potion, makaari feather, hazadaav, module parts, [a bunch of other temporary quest items probably, like Scoot's gui and such]

Core:
com link, shield, jetpack, gun, rifle, oru's gun

Have 3000 zorkins (coins/money) in your inventory. You get zorkins by selling items from the inventory. You can sell everything except quest items. Look around in cities for rare statuetes which bring more money. If you have issues obtaining enough there are additional 1000 zorkins for free: go to emea and go to the gork infested talan (cage on a walkway) - give him gork when asking to get the money. gork will be collected automatically when clearing gork eruption sites

Overheat the rifle and the pistol at the same time. Equip your weapons with any modules increasing the fire rate and fire power. I started with the rifle as it seems to need longer to cool down, then immediately switched to the pistol and shot into nonsense-land. Achievement achieved...

Glide for 3 mins - one great spot to get this achievement is to get all the way up on the mountains of Desan and fly all the way to the mountains of Palana/Prokriana

Get super low on health - shortly before dying teleport back to any village and get healed by the local shamaaz

Missable! When you arrive at the museum in Prokriana for the first time make sure you interact with any object from the first "Outcast" (aka Outcast 1.1 or Outcast - Second Contact) and listen to its story; don’t forget to interact once more with the shirt after the cutscene; be sure to obtain this achievement before the last act as the sankra tablet (chalk tablet) will be used for a quest and will be gone

Get into flying mode (gliding or ground boosting („F“ for pc), fly past any collectible item and hit use/interact when being close to collect it while flying - a great skill to have during play - much recommended

Get a drone flying close to the ground (drag them towards the bottom) and destroy it with a quick dodge-forward-melee attack (get it low on health with one or two shots before, so it is not flying away after attacking it once)

Congratulations! You are a true completionist! Now get out there and find your own Adelpha - until the third installment gets released.