Very straight forward. Progress through the game choosing only the heart decisions. If you are new to the anthology. Know that if you do not see a Heart symbol, simply say nothing. When it comes down to quick time decision making and no heart is available, let the timer run out.
New to this game as well, through the start screen. It will notify you the entire time if you have strictly stuck to making Heart or Head decisions. Way easier to keep track of. They unfortunately can be hard to see at times, so this is a HUGE bonus now. ( I got burned early on in Man of Medan because of this, not realizing I missed an opportunity early on in the game, only to find out at the very end when the achievement did not pop up. 5 hours wasted. Pay attention and learn from my mistake!)