Phoenix Wright: Ace Attorney Trilogy

Phoenix Wright is thrown into his first solo trial when his mentor, Mia Fey, is murdered. The suspect? Her sister, Maya. It's up to Wright to prove her innocence.
Case 2, Turnabout Sisters: Day One Investigation

Here's the steps to take to gather all the evidence you'll need for trial - at least for now.

Go to Mia's Office.
Examine Mia's body. You'll get the The Thinker and Glass Shards evidence. You'll also get the Receipt with the bloodied writing on it.
Check the rest of the air and examine the phone.
Head to the reception area and speak to Maya. Present her with the Receipt evidence.
Next, you'll be at the detention area. Tell Maya "It's up to you," when prompted.
Speak to Maya on every topic available. You'll get the Maya's Memo evidence, then speak to her again one last time, accepting her request.
Head back to Mia's Office building. Speak to the detective - it doesn't matter if you remember his name.
Speak with Detective Gumshoe about Mia, Maya and Miles Edgeworth. You'll get the Autopsy Report evidence.
Present Maya's Memo to him - you'll eventually get Maya's Cell Phone as evidence.
Gumshoe also let slip a new lead, so now head to the Gatewater Hotel to meet April May.
When you get the chance, examine the screwdriver in the drawer. Hmm...
Move on to Grossberg Law Offices. Here you meet Marvin Grossberg, and have a chat with him about everything you can.
Head back to the Detention Center and chat to Maya about all the new topics.
When prompted, choose to defend Maya. Tell her "I can't abandon you."
Present the Cell Phone evidence to her.
Head back to the Gatewater Hotel. Chat to the Bell Boy.
Now examine the drawer you couldn't earlier. This will yield some interesting evidence indeed - the Wiretap.

Case 2, Turnabout Sisters Day Two Trial

Before you even get to the trial in earnest, Gumshoe will describe events as the police see them - this adds the Floor Plan evidence to the court record.

Maya Fey's Arrest: Witness Cross-Examination

As per Maya's advice, press Gumshoe. Target his 5th or 6th statement in particular.

Hard Evidence: Witness Cross-Examination

Got 'em - present Mia's Autopsy Report to Gumshoe's 6th statement.
When Edgeworth queries, say "The day after the murder."
The next choice doesn't really matter - and next, a new witness takes to the stand.

April's Testimony: Witness Cross-Examination

The judge will ask if you want to cross-examine. The answer is yes, of course.
Press the 3rd statement, "The one attacking her..." or the 5th statement "But that girl,"
When prompted, choose "I question your Testimony," then "You're lying."

April's Testimony 2: Witness Cross-Examination

Throwing back to your last case, present The Thinker evidence on the 5th statement.
When prompted, choose "It couldn't have rung," and then whatever you like.
When next given the chance, present the Maya's Cell Phone evidence to contradict Edgeworth's suggestion.
When April explains and the Judge questions, say "Yes", then present The Thinker evidence.
As April melts down, select "You had heard about it," and then present The Wiretap evidence.
When Edgeworth presses you for evidence, present Maya's Cell Phone again.
The next choice doesn't matter, but when you get the chance, Call the Bellboy as a Witness. You'll need to Accept the Condition to continue.

Bellboy's Testimony: Witness Cross-Examination

Press on statment 4 and 5 to move things on. When prompted, choose to 'Protest'.
Ask about 'Check-in', 'Room Service' or 'Bed making' - all offer the same information.
When prompted, choose "The man with Miss May".
Once this is all over, you'll ge the May Testimony as evidence in the court record.

Case 2, Turnabout Sisters: Day Two Investigation

You'll begin at the Detention Center, but there's nothing of real interest for you here.
Go to the Grossberg Law Offices. Take one of the two photographs on the desk, adding the DL-6 Incident - Exhibit B evidence to your court record. You need the B photo specifically for this case, though the A one is interesting...
Now back to the Gatewater Hotel. You'll meet your old friend the Bellboy. Have a chat...
Chat to him about all the topics available. The topic 'The Hotel' will add a little color to events...
Present the Photograph B evidence to the Bellboy.
Have the Bellboy Write it down to then get the Bellboy's Affidavit evidence.
Back to the Detention Center. You have what you need to get May to open up:
Present the Photograph evidence to April. Then present the Bellboy's Affidavit.
When prompted, choose to Push her hard.
You can also 'Ease her Fears' and show the photograph to Grossberg instead at his offices - the result is the same.
Head to the Bluecorp building. This is a new location thanks to your investigation. You'll meet Redd White. Talk.
There are various topics. Work through them all.
When you ask about 'That painting', say "I've seen it before". Things turn sour.
Go to Grossberg Law Offices now. Grossberg is in, so talk to him.
Talk about all the topics, but some require more input.
When prompted, choose "He's blackmailing you".
Follow up on the other topics. If you want to show the photograph evidence, you give it back.
Return to the Fey & Co Law Offices. Here, examine the shelves behind the desk. Look through the files for some small revelations, plus the new Newspaper Clipping evidence.
Now head on back to Bluecorp. Present the Newspaper Clipping to Redd White.
When asked, choose "You blackmailed him," followed by "You're wrong."
You'll automatically go to the Detention Center. Follow through the last few conversations - then it's trial time.

Case 2, Turnabout Sisters: Day Three Trial

White's Testimony: Witness Cross-Examination

Press White's 8th statement, "she ran away". This statement then changes to be more specific.
Once the statement is changed, present the May Testimony that it now contradicts.
When the judge asks for an explanation, pick whatever you like.
Next, when prompted use the map and point that he was standing where the 'K' is written on the map. Present it.

She Ran to the "Left": Witness Cross-Examination

One-size fits all for this one. Present the Mia's Autopsy Report evidence on either the 4th, 5th, 6th or 7th statement.

The Two Accounts: Witness Cross-Examination

Press White's 1st statement, "I heard that thing fall". When asked, say "Yeah, very odd". This forces the statement to revise.
Present the Glass Shards evidence against the newly revised 1st statement. The Floor Plans can also have the same net impact.
When asked, pick "Big Problemo." When asked for proof, go ahead and present the Floor Plans.

The Wiretapping: Witness Cross-Examination

Press all 4 statements. This leads to some story shenanigans you have no control over.
During recess, you'll discover a revelation about the Receipt evidence, updating it in the court record.
Back in court, present the Receipt against any of the statements.
When Edgeworth asks for another day of investigation, Object, then Present Mia's Memo, which you've just been given.

Props to rpgsite.net for the guide