Spectral Force 3

To recruit Tina (and Folt), you need to complete the mission "Pure Heart".

Mission requirements: Recruit Anita, Kiratt, Rato and Rimm.

Recruitment requirements: Tina, Folt, Anita, Kiratt, Rato and Rimm do not retreat.

Once you have unlocked the mission, complete it without any party members retreating. It is okay for Begina and/or Diaz to retreat, but you will probably not be able to complete the mission if they do. Tina (and Folt) will be present from the beginning, but will probably not be much help to you as they will not move until very late in the mission. This mission can be quite difficult because Tina and Folt start on the far side of the map from you and enemies are continually spawning in between you and them, many of which will make a beeline for the two hapless potential recruits. Get at least one or two party members over to them as quickly as possible to help them out, as they will not survive long on their own.

Both achievements will unlock after you have saved your game.