The Tours & Tournaments Add-on for Crusader Kings III has 20 achievements.
Visit ten Kingdom Tier Vassals on a Grand Tour
As a Regent, sucessfully coup your liege to take their Realm without War or Schemes
As an Emperor, go on an Intimidation Tour visiting all of your Powerful Vassals
Successfully host a Murder Feast or Bloody Wedding
Finish both tracks of the Traveler Trait
Finish any track in the Hastiluder Trait
Finish all tracks in the Hastiluder Trait
Orchestrate a Grand Wedding where the Spouses become Soulmates
Have one of your Lowborn Knights win a Grand Tournament, then land them
Succeed with the Murder Intent while on a Hunt
Capture a large wild animal while on a Hunt
Finish the Falconer track in the Hunter Trait
With one Character, go on Pilgrimages to all of your Holy Sites
Participate in a Joust with a maxed out Horse track for the Hastiluder Trait
Pass through every Terrain, including navalm whilst on the same Travel
Succeed at a Legendary Hunt
Win every Contest at a Grand Tournament with at least three Contests
Have a max rank Acclaimed Knight with the Warrior of the Faith Trait
Starting as the Habsburgs, rule the Archduchy of Austria, plan 5+ Grand Weddings and don't wage War
Have a capital Barony with 60+ income, a stationed 500+ Heavy Cavalry Regiment and a mine