How To Unlock Faster Than The Flame TrophyAt the start of Memory Sequence 5, a tutorial will show you how to perform slide assassinations. Memorize it! These are really fast, and they don’t interrupt your movement. You’ll have to keep running throughout the whole level, so they’ll come in handy.
When an enemy is below you, use the drop assassination technique. If you make a mistake, you can restart the checkpoint – it will turn back the clock to the time when you passed it. You can press X on Playstation or A on Xbox to climb faster.
Here’s a video showing the speedrun: