https://wccftech.com/grand-theft-auto-the-trilogy-the-definitive-edition-achievements/

The achievements for all three games included in Grand Theft Auto: The Trilogy – The Definitive Edition have been leaked online.

The Grand Theft Auto: The Trilogy – The Definitive Edition achievements, which have been shared on the GTA Forums by alloc8or, aren't particularly creative, with a few exceptions, so those who have played the original releases should have no trouble unlocking most of them.