To ensure all your activities show up under the Activity History (as opposed to Open Activities) make sure you have a "Completed" values in the Task Status list and that it's a "Closed" state.
Here is how to check it:
- In SFDC, go to Setup > App Setup > Customize > Activities > Task Field. Click on Status
![rtaImage.png](https://nation.marketo.com/servlet/JiveServlet/downloadImage/102-1221-4-79251/rtaImage.png)
- In the Task Status Picklist Values list, check if you have a "Completed" value. If you do have it, skip to step 5.
![rtaImage (1).png](https://nation.marketo.com/servlet/JiveServlet/downloadImage/102-1221-4-79252/rtaImage+%281%29.png)
- You need to create the "Completed" value. Click on the New button
![rtaImage (2).png](https://nation.marketo.com/servlet/JiveServlet/downloadImage/102-1221-4-79253/rtaImage+%282%29.png)
- Type in Completed and click on Save
![rtaImage (3).png](https://nation.marketo.com/servlet/JiveServlet/downloadImage/102-1221-4-79254/rtaImage+%283%29.png)
- Click the Edit link next to the Completed value
![rtaImage (5).png](https://nation.marketo.com/servlet/JiveServlet/downloadImage/102-1221-4-79255/rtaImage+%285%29.png)
- Check the box next to Closed and click on Save.
![rtaImage (6).png](https://nation.marketo.com/servlet/JiveServlet/downloadImage/102-1221-4-79256/rtaImage+%286%29.png)
Once the steps above are completed, you should now Completed in the list with "Closed" checked like this:
![rtaImage.jpg](https://nation.marketo.com/servlet/JiveServlet/downloadImage/102-1221-4-79257/rtaImage.jpg)