Fix calendar alignment and add achievements section 2️⃣

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Note: This is part 2 of a few merge requests targeting profile-layout-reorganization. We're splitting into several in the hopes that it'll be easier to review 🤞

The final set of changes will look something like Update profile page layout (!134569 - closed)

Part 1: Reorganize profile page layout 1️⃣ (!136910 - merged) • Annabel Dunstone Gray, Sascha Eggenberger • 16.7

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What does this MR do and why?

• Show full 12 month calendar on all screen sizes
• Scroll calendar when out of room
• Add achievements section

Screenshots or screen recordings

Before	After

#430244 (closed)

(Carried over from last milestone)