Depending on the player's progress in the game, unique animations are displayed in the home menu to show this, but only a few can be shown at a time. They can be unlocked by completing levels, and Unlockable Levels. Year 2 levels do not unlock any Home Menu Animations. As for the current Wave 9 update, only the Story Mode Animations play on the main menu of the game.

Story Mode Animations

Unlockable Level Animations

Year 1

NOTE: There is also another Portal 2 Menu animation featuring Chell just on her own by completing the same level.