The earliest years on this checklist predate the kangaroo design entirely — they're Gold Nugget-era coins, which some collectors deliberately include in a "complete" set and others treat as a separate, optional pre-history. Decide which camp you're in before you start filling in the oldest entries, since it changes what "complete" means for this particular list.
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It's a personal call — some collectors include the pre-kangaroo Gold Nugget years as part of the same lineage, others treat them as a separate, optional pre-history. Either approach is defensible; just decide before you start checking off the earliest entries.
1993 — the Mint switched to a kangaroo reverse and began changing that design annually, following the same approach the Chinese Panda pioneered, which is why the coin is now sold under the Kangaroo name.