Robinson's second two-run homer of the game made it 6-6 in the eighth inning. Jamie Romak then singled and Mike Baxter drew a walk.
After Roger Bernadina swung and missed for the second out, Triunfel stepped in and crushed a pitch to left field for a three-run homer. Reliever Gonzalez Germen (3-1) saw his ERA balloon from 0.44 to 2.53.
"The end of the year, you don't want all these long innings, (but) Carlos came up and had a great at-bat," Robinson said. "The guys before him, Romak getting on, Baxter had a great at-bat to get on and Carlos took a great swing to take us ahead and help us get the win."
Yimi Garcia came on in the ninth and struck out two of the four batters he faced to earn his fifth save. Fabio Martinez (1-0) got the victory after pitching a scoreless eighth.
Albuquerque (61-79) trailed 5-1 in the sixth inning and had just three total hits, two by Triunfel, when Joc Pederson singled with one out. Two batters later, Robinson crushed a towering two-run homer that landed above the Calibers sign in right field.
"That first homer, I'd struck out the first two at-bats and I was just trying to get something over the plate, something I could hit, put the ball in play," said Robinson, who had not hit two homers in a game since June 12, 2011, when he played for Omaha. "The second one, just swing it and hit it, not thinking anything in particular."
Andrew Brown's solo homer, his second blast of the game, made it 6-4 in the seventh. The Isotopes would pick up another run in their half of the inning as Mike Baxter beat out an infield single, went to second on an error, to third on a groundout and scored on another groundout by Triunfel.
Albuquerque was able to overcome a rough start by Chris Reed. The lefty gave up five runs on nine hits and two walks in 5.2 innings.
In comparison, Las Vegas (80-62) saw starter Cory Mazzoni roll along. He gave up three runs on five hits, struck out 10 and did not walk a batter.
"Their starter, man, he pitched really well," Robinson said. "He had three pitches working really well for him. He kept us off-balance all night."
The Isotopes and 51s will take Saturday off due to the University of New Mexico football game going on across the street. The series will resume Sunday at 6 p.m.