HITMAN 3 has 47 trophies/achievements that can be earned by playing content included in the Standard game on Xbox, PlayStation and Epic. Earning them all on PlayStation will unlock a Platinum trophy.
In addition, HITMAN 3 includes trophies/achievements related to accomplishments in HITMAN 1 and HITMAN 2. These legacy trophies/achievements can be automatically unlocked in HITMAN 3 once players have carried over their progress. Simply put; if you have met the requirements for the legacy trophies/achievements after carrying over your progress, they will automatically unlock when you start HITMAN 3 for the first time.
For example, if you have earned the Inflitrator trophy/achievement in HITMAN 2 (for completing the Nightcall mission) and then carryover your progress, that trophy/achievement will unlock in HITMAN 3 automatically.
There are very few exceptions where the trophies/achievements will not automatically unlock. These are all related to earning a certain score/rating in a mission and are mostly related to the Sniper Assassin mode. To unlock those legacy trophies/achievements, all players will need to complete the requirements in HITMAN 3.