For this trophy you must clear any route on hard difficulty, you can also play it on the Asia route so you can earn Perfect Trainee at the same time. If you do end up playing it on Asia here are some things to look out for in your A.I opponents.
Leixia is weak at mid-long range and doesn't have a tremendously high damage output. Her power comes from her movement and how predictable she can be but because she is under the control of a CPU A.I you won't have to worry about that. Poking her out with long range can keep her at bay. Which out about getting hit on Counter Hit with her as she can follow it up into her Brave Edge and even into her Critical Edge if she starts to get in on you.
Though Xiba may seem threatening and you want to back away and wait for openings, that is exactly the opposite of what you should be doing. His strength comes from mid-long combat. However, compared to other characters in the cast, he is slow and can be put into pressure by the right player. Another problem players seem to have is knowing when you can punish and knowing the difference between the high and low attacks. Xiba likes to throw those in and if he confirms it with Critical Gauge, he can convert it into damage with a Brave Edge.
Natsu is a force to be reckoned with, with her fast normals and her teleports into high damaging moves you want to be patient when fighting her. Even her normals are safe on whiff so punishing missed normals could hurt if she hits you in the right spot. Additionally you want to watch out for her Oki set up with Exorcism. If put into the corner she can hit you into a unblockable set up for VERY big damage which is one of the many frustrations against Natsu.
Yoshimitsu relies on close range pressure to get in on his opponents and heavily lacks anything from a distance. If you can take notice to his mix up moves and block accordingly, you should be fine. Also take note that this match takes place on Mt. Fuji the Holy: Hidden Dragon which is the stage with the wooden raft with no walls to prevent ring outs which is a good option to aim for if you are having trouble against him.
Against Maxi you want to space him well, once he gets into a offensive momentum its hard to push him out of it. Throwing out pokes to tell him to back off during his pressure strings is a good way to get out.
Kilik has the ability to take on the weapon style of any male character in the game so approaching him comes down to your knowledge of each individual character. Make use of the stage, just like the fight with Yoshimitsu this one takes place in Mt. Fuji the Holy: Hidden Dragon so you can aim for ring outs.
For help on character choice and moves to use with those characters, please refer to Sudden Temptation for more information.