Grave : À È Ì Ò Ù
Acute: Á É Í Ó Ú Ý
Circumflex: Â Ê Î Ô Û
Umlaut: Ä Ë Ï Ö Ü Ÿ
All the above are essential in upper- and lower case.
Welcome at this site, but could you please help us to understand your problem better:
This is
- a question(?) concerning fonts?
- concerning keyboard layout?
- concerning availability in unicode (sound a bit ridiculous, though)?
- concerns availability of an “afrikaans language” set?
Please also name your OS and the version of LibreOffice you use.
.
With my (german settings) I can just type all accents before the letter like ` then e for è and my keyboard even has ÄÖÜ directly available, but I never tried africaans. But therefore I don’t “see” where your problem is.
All these characters exist as “precomposed forms” in Unicode. Except for LATIN CAPITAL Y WITH DIAERESIS, they are allocated in Latin-1 Supplement block (upper- and lower-case) at U+00A0 to U+00FF. The exception is in Latin Extended-A at U+0178.
So, your question is not about existence (na deven not about availability in fonts because practically all of them implement these primary blocks.
Your question is likely about how to enter them in a user-friendly way from the keyboard. Answer depends on your OS, as already mentioned, your keyboard layout and your locale (primary language). You mentioned none of them.
If you live in Zuid Afrika, your keyboard is ready to be used with Afrikaans. Have you read basic manuals about your keyboard?