Data Master is an achievement/trophy in Deus Ex: Mankind Divided. It is awarded for completing all of the Versalife, Steiner-Bisley and Tarvos Tier 3 Network servers in the Breach mode of Mankind Divided. The achievement is also available in the standalone release of Breach.
Tier 3 has a single network, Network 3A. Complete the servers belonging to VersaLife, Steiner-Bisley and Tarvos to complete the achievement.
Only standard servers need to be completed. It not necessary to complete any of the Darknet nodes or to collect any of the reward notes. Completion of bonus objectives is not required.