Days Gone

After completion I was level 42. While there I was completing tasks, I cleared out the bases and became 44. I thought a little more, 45 and that’s it. But no, I got 45, but the trophy didn’t drop because one upgrade was not purchased. I don't know why, maybe it's a bug or something. I had to knock out level 46 in hordes, buy the latest improvement and then the trophy dropped.

so initially 1 level and 0 skills, that’s why it wasn’t enough

There is a good option to extinguish the horde if there is tall grass nearby in which you can hide. We quietly get as close to the horde as possible, hide in the grass and throw bait with explosives (it’s better to stock up on them in full), after the first freaks from the horde come to it and fly into the air, we repeat again and again. You can also throw simple bait, and then napalm/molotovs/grenades. The very essence of this feature is that it does not glow, i.e. do not look out of the grass while aiming a firearm, a machine gun, for example, or a pistol. You can throw explosives, the freaks won't see you. Well, don’t slow down too much. Thus, he destroyed the first story horde, and when he finished the story lines, he was level 42. Using the method described above, I destroyed almost all the hordes only in the southern region (they are mainly in caves and each cave has tall grass), and has already reached level 46. They give you 4000 experience + you get experience for the kills themselves.