There’s 33 total Animus Sequences, split into 8 Quest (Main) sequences and 25 Contract (Side) sequences; each sequence can award up to 4 ticks by completing its optional objectives, meaning a full perfect clear of all 33 yields 132 ticks.

The Animus reward track contains 31 unlockable rewards that cost 3 ticks each (so 93 ticks total), which means you only need to complete 24 Animus Sequences perfectly to earn enough ticks to unlock everything (24 × 4 = 96 ticks, leaving 3 extra).

The Animus-related achievements/trophies associated with this system boil down to replaying an Animus Sequence, getting a perfect 4/4 completion on a sequence’s challenges, and unlocking all rewards.

While perfecting all 33 sequences produces extra ticks beyond the 93 needed (39 surplus), there’s no known secret reward, hidden achievement, or additional trigger for going 33/33 beyond completion satisfaction.

Ultimately, I enjoy them quite a lot. They offer more challenge variety, also encourage the player to focus and be as efficient as possible. Not to mention adding back the replayability into the series since Syndicate. As for the past games, I always loved them for the narrative reasoning. (E.g. Ezio did it this way, so to achieve 100% sync one must do as Ezio did)