The timer starts when you open the rift and stops when you talk to Oreck again after killing the RG.

One person should have a timer running (for example this stopwatch on a second display or your phone).

Make sure to equip Homing Pads (or have a 100% uptime on Epiphany if you're monk). This person is the designated "closer" and will teleport to town at 1:45 minutes (or earlier if the RG is almost down). You want to talk to Orek the second the RG is dead - if and only if your stopwatch is below 2 minutes. If not, just go back to the rift and let everyone loot, and close once everyone is done.

Most important point which is the "make or break" for this achievement: DO NOT LOOT.
As long as you're on and have a chance to complete this rift, do not pick up anything - just focus on killing (and staying alive, of course).
You can pick up the loot afterwards, during the 30 seconds timer in case you succeeded, or you have all the time in the world in case you miss it and you run over 2 minutes (in which case the closer simply doesn't talk to Orek).

READ MORE HERE >> http://www.diablofans.com/forums/diablo-ii...nd-achievements

actually this is easy.... just need big open map with nice density... I did both in SC and HC... if T13 in 2 mins is another story ...

or you can join conquest community and look for carries. if you look at peak hours there are people willing to help get it done for you