Achievement Is Very Hard.
This Means You Must Win A Run Without Picking Up Any Extra Passive Skills
(Should Have Seven Empty Vestige Slots.)
- I Advise Doing This In A Co-Op* "Quick Run", As Your Partner/s Will Be Able To Carry You.
- I Did This With The Clairvoyant Class, So I Could Shield Myself And Move Enemies Around.
- Rely On Augments And Ascensions To Stack Damage/Defense.
I Did This About 10 Times Before We Beat It, Twice With A Party Of Three.
- The Key Is To Have Your Co-Op Partners End Up With "Busted" Builds.
- They Can Grab Vestiges, So They Can Scale Up With Set Bonuses.
The Run I Won On, One Of My Teammates Were Doing 11,000 Damage Per Turn, While The Other Teammate And I Were Healing For ~8 HP A Turn.
- Ascended Restoration With Three -1 Cooldown Upgrades.
Achievement Pops At The End Of The Run.
*Side Notes:
You Might Be Able To Do This Solo, As Clairvoyant I Got To Stage Three And Had The Kraken Boss' HP Bar To 1/5th Of Its Max, But Then I Died.
- You Will Probably Have To Get A VERY Good Build Of Rare Augments To Do This Solo.
- Just Go Ahead And Find One Or Two People To Help You, Then Switch Off Who Doesn't Get Vestiges For Each Run.
Picking Up A Vestige From A Coffer, Then Dropping It, Invalidates The Run.
Good Luck!