- Prothean : Ask Anderson at the begin of the game when he tell you about the beacon
(
Warning - If you missed that, you cannot unlock the achievement later, you will have to redo a character)
- Geth : Ask Ashley when you met her
- Elcor and Volus : Both in the office next to you when you first spawn in the presidium
- Rachni : Ask Avina in front of the Krogan statue in the Presidium
- Keeper : Ask Avina in front of the Citadel Tower elevator
- Hanar : Ask the preaching Hanar in the presidium
- Krogan : Meet Wrex
- Quarian : Meet Tali
- Batarian : When you meet Anderson in the docking bay, ask him about Saren (Also automatically unlocked by playing the Bring Down the Sky mission)
Credit to Nihleen on Steam for their
guide.