After a brutal 2 1/2 hour journey into Sapphire Queen gate and a rough 6th Strata (all fire), I finally emerged victorious through 29 clockwork levels without a single death to my name. Dauntless Delver achievement is mine.
Now the only achievement I'm lacking is the 10,000 minerals one. Oh well.
I got dauntless delver sort of by accident. A guildy wanted the achievement so I came along to assist and take some damage for him. At the end of T2 I realized I hadn't died yet so I actually played it safe and got through T3 with little damage taken.
In that run I managed to get bronze survivor, silver survivor, gold survivor, cradle and all and dauntless delver. Actually getting through 0-29 with no deaths was pritty awesome considering i never actually picked up any of the survivor metals before that run. I made roughly 11k off that run after minerals and mats.