Hey there. if you have unlocked all the mods, you can reset the artifact for free, then simply unlock all the artifacts again straight away. This time they will be counted for the triumph - the bug was caused when Piercing Sidearms was re-locked near the beginning of the season, this broke the triumph for anyone who had purchased it.
Note that you don't need to unslot mods from your gear first or replace them when you're done re-unlocking.
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HadiHooStand Up & Speak Up - old
Yes, its working now. Thanks for your info bro!