Suggested fix (unconfirmed): Farm foil points to hit shop jackpots for a 25% chance to get a relic booster, and check the relics page for remaining question marks.
The problem
So I beat the game and got all relics, but after logging in just now I did not get the ahcievement along with the others (heros and tomes and last crucible prestige 1). I figured this one was bugged too, but I do have relics I've unlocked but destroyed for relic slots. Am I really expected to grind out monsters and the jackpot for 1 crystal a pop? Say it ain't so lol
What players suggest
Have 8. locked ones. Ill try the jackpot thing, thanks!
Suggested fix (unconfirmed): Unlock the upgrade that grants a 25% chance for a relic pack on a jackpot, then grind jackpots while speeding through levels between visits to the skill tree.
Suggested fix (unconfirmed): Update the game and open another relic pack. If still stuck at 38/39, roll the shop to hit jackpots for a 25% chance of getting a relic pack.