Ecological Succession

Fishing gives you 1%, collecting robots with data gives you 3%.

▶ TLDR: There are multiple things you can do to get credit for this, but probably the fastest way is to just do the weekly quests ([storyline=5704]) and/or Devourer Attacks' Bosses Quest Items (Making a Deposit) as each of them give 20% credit towards the World Quest.

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• You need to do only 5 things with 20% credit to be done with the World Quest.
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• Guide for how to unlock Ecological Succession (World Quest) by Zvez
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• It'd appear you only have to unlock this once for you to be able to do this World Quest on any alt!
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• Check screenshots tab if you are unsure what to look for!
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• If for some reason the World Quest doesn't complete at 100%, leave the Oasis (Eco-Dome) area and then go back again. Thank you Karnick for pointing this out!
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▶ WEEKLY QUESTS

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• Pick weekly quests ([storyline=5704]) by The Oasis Console from the NPCs around it, like from Ve'nari, [npc=230736], [npc=232385] and [npc=235353]. Each quest can give up to 20% credit per quest towards the world quest!
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/way #2371 75.9 34.1 The Oasis Console

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• You unlock more weekly quests to do the more you complete the story lines in the Oasis (Eco-Dome). These also seem to be something you need to unlock only once, but you will have access to the whole quests lines on alts, if you want to do them again. Check Otherworldly Ecologist for the story lines.
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• You get more weekly quests on weekends (Saturdays?) to do, if you are looking for to complete the Ecological Succession achievement.
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Hint: While not necessarily related to Ecological Successions, I'd recommend picking More Than Just a Phase as well in case if you need to do something in Untethered Space like for example killing the rare [npc=234845] in the Oasis (Eco-Dome) or killing devourers for Anima Reclamation Program.

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▶ INSIDE THE OASIS (ECO-DOME)

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• Killing the rare [npc=234845] inside the Oasis (Eco-Dome) on the platform while in Untethered Space gives 20% credit.
  Sthaarb also has chance to drop [item=246160].
  
  Killing the rare [npc=245998] does NOT give any credit.
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• [object=487199] are small dirt piles on the ground you can dig up, and gives 3% credit. Here's some locations where I found them:
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/way #2371 71.7 34.1 Torn-up Earth
/way #2371 72.1 30.9 Torn-up Earth
/way #2371 72.5 34.9 Torn-up Earth
/way #2371 72.9 36.1 Torn-up Earth
/way #2371 73.1 29.0 Torn-up Earth
/way #2371 73.1 31.9 Torn-up Earth
/way #2371 73.1 34.2 Torn-up Earth
/way #2371 73.2 28.4 Torn-up Earth
/way #2371 73.6 33.3 Torn-up Earth
/way #2371 74.5 34.2 Torn-up Earth
/way #2371 74.7 28.3 Torn-up Earth
/way #2371 75.4 35.8 Torn-up Earth
/way #2371 76.2 31.6 Torn-up Earth

Note: It seems like at least these torn-up earth dirt piles are shared among other players as well.

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• Fishing [item=241353]s gives you 1% credit. You can do fishing in the deep parts of the water. Here some locations:
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/way #2371 72.4 33.9 Hydrobite (Fishing)
/way #2371 72.5 31.8 Hydrobite (Fishing)
/way #2371 73.7 32.1 Hydrobite (Fishing)
/way #2371 75.1 31.6 Hydrobite (Fishing)
/way #2371 75.7 30.5 Hydrobite (Fishing)

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• Watering plants with [object=483713] gives you 3% credit. You can water basically any groups of large orange, long pink and light violet flowers with it, but you can only do it ONCE per jug. Here's some locations where I found the watering jugs:
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/way #2371 71.5 32.7 Watering Jug
/way #2371 71.9 29.2 Watering Jug
/way #2371 72.0 29.1 Watering Jug
/way #2371 72.7 32.1 Watering Jug
/way #2371 72.9 33.4 Watering Jug
/way #2371 73.6 29.7 Watering Jug
/way #2371 73.7 31.9 Watering Jug
/way #2371 73.7 35.2 Watering Jug
/way #2371 74.1 33.2 Watering Jug
/way #2371 74.9 28.0 Watering Jug
/way #2371 74.9 30.7 Watering Jug
/way #2371 75.3 32.1 Watering Jug
/way #2371 75.8 33.9 Watering Jug
/way #2371 76.4 30.9 Watering Jug

Hint: By the Oasis Console you can see the three types (orange, pink and light violet) of K'areshi plants (flowers) you can water.

/way #2371 75.9 34.1 The Oasis Console

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• The "robots" people are referring to are the [npc=233187] you meet earlier during the Eco Dome quest line. Click to talk to them to get 3% credit. They wander around a bit, but here's some spots:
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/way #2371 71.6 34.0 Data Collection Drone
/way #2371 72.0 29.2 Data Collection Drone
/way #2371 73.6 36.0 Data Collection Drone
/way #2371 73.8 28.8 Data Collection Drone

You can use

/target Data Collection Drone

to find them easier.

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• [npc=233202] start to appear as well inside the Oasis (Eco-Dome), and give 2%, 5% or 8% credit depending on your answer, when you talk to them. You can only talk to each [npc=233202] once.
  Assuming they start to appear after you have completed Shameless Hawking
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You can use

/target Visiting Broker

to find them easier.

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▶ OUTSIDE OF THE OASIS (ECO-DOME)

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• Devourer Attack's BOSSES around K'aresh have chance to drop items (for example [item=232467] drops from [npc=231229]) for you to get a quest (Making a Deposit) to take it back to Ve'nari and they give 20% credit each quest.

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• As long as you participate in the events and attack the bosses, you should get the loot from the bosses. No groups necessarily needed.
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Devourer Attack: The Oasis - Boss: [npc=231229] - Item: [item=232467] - Item Quest: Making a Deposit
Devourer Attack: Tazavesh - Boss: [npc=235104] - Item: [item=238665] - Item Quest: Making a Deposit
Devourer Attack: Eco-dome: Primus - Boss: [npc=234970] - Item: [item=238663] - Item Quest: Making a Deposit
Devourer Attack: The Atrium - Boss: [npc=235087] - Item: [item=238664] - Item Quest: Making a Deposit

Note: You can get/complete each item/quest once per week per character.

Hint:

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• If Anima Reclamation Program is one of the weekly quests, you can get credit for it from the Devourer Attacks as well.
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• The bosses also drop [item=246240], which you need 20 to get [item=246159].
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there were only 4 blue quests which only gave 80% for the Ecological Succession Mega quest, for the remaining 20%, u can do the following:
- interact with the robots (Data collection drone) around the oasis for 3% each (i only found 4)
- fish the rest from the bond for 1% each at /way 75, 32