List activities are where you can see a time and date-stamped log of everything that's happened within the list since it was created. You'll also see who did each of these actions. To access them, swipe left on the list name and tap the "..." button, or if your list is already open, tap or click on the list name. From there, tap or click on "Activities".
You'll see three tabs shown at the top:
- Activities: This shows all actions taken within the list, including updates to tasks and comments. You can add and reply to comments from here.
- Comments: This tab only shows comments on tasks. No actions are shown. From here you can also add comments to the list itself.
- Changes: This tab shows only changes made to tasks or to the list itself. No comments are shown.