Here’s a list largely compiled by darkslayer of theforce.net, but edited by me to include that nest of Gundarks, to exclude the shields in the The Clone Wars film, because that was technically Ahsoka, and updated with the new canon source for that business on Cato Neimoidia,* which, in Legends, occurred in Labyrinth of Evil and involved a missing rebreather. The previous answer here was true at the time, but uses enough examples that are now Legends that, to my knowledge, there are only ten canon times.
That nest of Gundarks
AOTC: Anakin recovers from the Force Lightning and blocks Dooku's would-be fatal blow
Landing at Point Rain: Anakin and Ki-Adi-Mundi save Obi-Wan and his forces from the Geonosians.
Grievous Intrigue: Anakin rescues Obi-Wan and Adi Gallia from Grievous's ship.
The Citadel: Anakin deactivates the electrical field holding the rescue party's weapons (including Obi-Wan's).
Kidnapped: Anakin difuses the bombs around the Togruta village, allowing Obi-Wan to use the Force to beat up a Zygerian slaver.
Escape from Kadavo: Anakin and Plo Koon liberate Obi-Wan and the Togrutas from slavery.
The Lost One: In their fight with Dooku Anakin uses the Force to stop Obi-Wan from falling.
Old Friends Not Forgotten: That business on Cato Neimoidia.
ROTS: Anakin defeats Dooku and brings Obi-Wan along unconscious on his back.