Me and my fireteam + some others have now done the Rift Generator Public Event 2 times now with absolute no damage to the Generator, still no Triumph even though we have done what it says. No one got the Triumph.
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Yep still bugged in 3rd week of January. Myself and 4 others had 3 bubbles and 2 tethers and it didn't take any damage after the first arc charge. Took the normal version of the public for the full 5 minutes no damage, maintained at 100%. Don't try for this triumph until bungie eventually fixes it in a patch post-black armory.