I can barely tell what the avatar unlocks look like at 80% HUD size because they are tiny on PC. 100% HUD size makes it a little better, but they are still slightly pixelated. 100% also makes every other UI element seem too big for 1920x1080.

80%:

100%:

This is also an issue with item icons used in chat.

Actual size lol:

At least there is an option to increase the font size, but it would be nice if we could change the size of icons separately, so the font isn't massive.