This Seeking Tech guide will show you how to get the Cleared: Metal Slug 2 trophy from the PS4 version of Metal Slug Anthology. This will unlock when you beat all six levels in Metal Slug 2.
To make the trophy easier and faster, set the Continues setting to Free Play, which will give you unlimited retries. You can also lower the Difficulty mode.
You can find the video with time stamps below:
0:26 Mission #1
3:50 Mission #2
11:01 Mission #3
17:29 Mission #4
25:00 Mission #5
37:34 Final Mission