It is not a common mode. The trials appear at the end of each week until Tuesday. Everything on the Triumphs is something that can be obtain through common modes (anything that appears DAILY) (......DAILY!! XD ) Even if a player does not like certain modes, they have more than enough chances to achieve the triumphs (......DAILY!!!) as the year is not up. The Iron Banner is also not a part of the triumphs because it is not something that can be played more often (ie.....DAILY!!) There is a reason the word "entitlement" is often used for these types of threads.