If you still need achievements in these two games (rather than the shorter lists for their content which appear as an extension of Hitman 3's achievements), this is probably a sign that you'll want to crack on sooner rather than later. It's not entirely clear what this simplification of purchase options might mean for the two delisted games going forward - while owners should still be able to play them, IO's clear focus on Hitman 3 (or Hitman: World of Assassination, as it will soon be known) likely means that ongoing support won't last forever, which could present issues given how many moving parts there are in how the Hitman games work.