there is more than one tailed beast that the akatsuki catches, you'd have to be more specific, however the 8 tails (killer b) and the 9 tails (naruto uzumaki) have not been caught by the akatsuki
episode 71 they capture the 2nd tailed beast and episode 144 they capture the 6th tailed beast
In episode number 21 of naruto shippuden.
The jinchuuriki for the Yonbi (four-tailed beast) is Rōshi.
If I remember correctly the first tailed beast they collected was Gaara, the Shukaku. The first one they attempted to retrieve was Naruto, The nine-tailed demon fox, or Kyubi.
He was the host of the six tailed beast.
episode 71 they capture the 2nd tailed beast and episode 144 they capture the 6th tailed beast
Episode 796 the 7th beast apppears
The capture of five tails and seven tails where not shown in the manga nor anime.
In episode number 21 of naruto shippuden.
Shippūden episode 121
Shippuden Episode 112
Naruto Shippuden episode 72: The Quietly Approaching Threat.
Naruto Shippuden Episode 99: Raging-Tailed Beast.
Episode 99 is about sealing the three tailed beast and creating a barrier over it
In episode 151 it was pain that defeted Sir Utakata.
the two-tailed beast
the provent has 1000 tailed beast.