You probably just kept getting duplicate nodes. The triumph requires that you scan all 40 different nodes on Mars, not just 40 nodes. Unfortunately, there's no protection to prevent you from getting duplicate override frequencies. Here's a checklist where you can see what nodes you still need: https://www.d2checklist.com/3/4611686018484370644/checklist And here's a helpful guide for completing the triumph: https://www.reddit.com/r/DestinyTheGame/comments/8u066q/4040_sleeper_nodes_simple_guide_on_getting_all/