"040: Kill the shadow enemy in Port Alex. ??? (Does anyone remembers the exact location?)"
After you use the crane to cross over onto a new part of highway, you start a gun fight after that, he appears during that, in a rather obvious location, on top a truck or something.
Incase I am mistaken about the fight being after the crane, I will say it is definately the fight directly before the friendly special forces arrive, though I am sure they are one in the same.
During the first part of the final fight against SURGE (level 21)
"016: ??? (Does anyone know what counts as a boss fight between Banks and the XA19?)"
It's the big battle against SURGE mentioned above (I still haven't got that one). It should be no damage during the two parts of the battle.
"076: ??? (If you drive as if you don't know the way. How do you unlock this title?)"
Just take a lot of time on a driving section, or maybe go backwards. I got this one on level 9 (I think) going back down when I arrived at the top, then back up to finish the level.
"089: ??? (Does anyone have any idea how to unlock this title?)"
Play the game for twenty-four hours.
"100: ??? (I guess this one is "Obtain 100 titles")"
or "Obtain 99 titles"
I'm at 90/100, still missing:
016: Defeat SURGE at the end of level 21 without taking damage.
033: Perform ten or more special shots in a single level.
063: Collect all Stamina signs in the game.
065: Clear all fires from the subway.
069: Save Iris in 25 seconds or less in level 15.
072: Disarm the bomb in level 23 quickly.
080: Complete the driving sections in level 11 with a high average speed.
082: Complete the driving section in level 12 with a high average speed.
097: Complete the game on normal difficulty.
100: Obtain 99 titles
I intend to get 16, 33, 63, 65, 69, 80 and 82 before finshing my normal difficulty game, as I should get 72, 97 and 100 when beating the last level. Then I'll play Real Disaster mode.