these trust grinding methods do not work. i've finished my first playthrough of the game and i've reloaded 2-5. after killing all the monkey bots the highest it has gotten a character to is about 75% of the way up the third bar, which is about 1 bar more than what they start with. this leaves me still having to play all the way up to like act 4 just to get one of them to max trust.
for the act 2-5 grinding method though, i swear it doesn't work. i sit there killing the monkey bots and the characters keep complimenting me and whatnot, but then by about the time i switch weapons, all they do is keep telling me to hurry up and their trust stops raising.
i don't see how people are getting the trust achievements like this.