Mine are:
- wave to Xur every weekend and wave to Rasputin each time I do that mission.
- Dance while waiting for Archon Priest, wave while he gets out of pod, blink away at last second.
- sit in Winter Kell's throne after defeating him.
English
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Make sure you wave goodbye to Xur as well. He brings better stuff that way (; [spoiler]If only.[/spoiler]