Getting an array of all triggers in the scene

Yes. This function allows to enumerate all colliders in scene, and then it's need to check IsTrgger value:

 using System.Collections.Generic;
 
 public class Triggers : MonoBehaviour 
 {
 
     private List<GameObject> objectsWithTriggers = new List<GameObject>();
 
     void Start () 
     {

         Collider[] cols = FindObjectsOfType<Collider>();

         foreach(Collider col in cols)
         {
             if(col.isTrigger)
             {
                 objectsWithTriggers.Add(col.gameObject);
             }
         }
     }

FindObjectsOfType() is slow! Keep it in mind.