This is a rather tedious achievement because it's very easy to miss.
The requirements for this is as follow.
Part 1: Investigation - Breaking Jean's Psyche-Locks for "Maggey's Motive"
The correct answer to break the lockers are:
- Present Jean Armstrong's Profile.
- Present Victor's Note.
- Present Magatama.
- Present Jean's Loan Contract.
Instead of going straight for the above, deliberately present a wrong evidence (any will do) before each step. Every wrong answer will unlock a new fancy foreign word. You'll also be penalised for the wrong answers.
After doing the above, present every available evidence and profiles to Jean before progressing the story. Make a save after this, and do not overwrite it.
Part 3: Investigation - Meeting Jean in the kitchen after visiting Blue Screens, Inc.
You'll get these conversation options:
- Trés Bien
- The woman just now (present Jean's Loan Contract to open up more details for this)
- The woman just now (after presenting the loan contract)
- Tender Lender
After doing the above, present every available evidence and profiles to Jean before progressing the story. You must do it now before he disappears. Make a new save after this, and do not overwrite it.
Part 4-1: Trial - Phoenix Wright vs Jean Armstrong
There are four cross-examinations during this trial:
- At Trés Bien
- The Mirror
- In the Restaurant
- The Confession
During the cross-examinations, press every statement that Jean makes before presenting contradictions to progress the story.
I got the achievement during the "In the Restaurant" cross-examination. But if it doesn't for you, keep pressing until all the cross-examinations are done. If the achievement doesn't unlock, you've missed a step. Reload the previous saves to try again.
A lot of the pressing and presentation of evidences and profiles will not give you any new fancy foreign word. It's just easier to do it this way because it ensures that you don't miss anything.
Good luck on this one.