I'm a member of a large local twin group and I know only one mum who managed to actually EBF (no bottles, no pumping). Interestingly she also went the longest before delivery (39+7 I think).
The thing with twins is that there are more often issues surrounding prematurity, low birth weight, nicu stays and other issues.
I was determined to EBF. Didn't occur to me that I wouldn't. My boys were born at 35+1 but one had IUGR - he was 3.5lb, the other 4.5lb. They were taken straight from me to nicu and I didn't see them for 7 hours, held one the next day, and the other a few days later. They weren't on cpap and tube fed. I started expressing right away but my supply was limited. It was 1 week and 4 weeks before I could try latching them, and then only occasionally as they were weak and couldn't manage it.
One came home after 17 days and I tried desperately - he still had his NG tube and I would feed him for nearly an hour and he'd still be starving. I'd be soaked where the milk was just falling out of his mouth. His latch was never right and I had no help or support, even with one as an inpatient. I tried everything I could find and think of. I was pumping every 2-3 hours, and not even making half of what they needed.
The other was very unwell and didn't come home until 8 weeks. He couldn't latch well either. He immediately became sick with a bug and couldn't breathe through his nose so couldnt feed.
Ended up being whooping cough and I had to stay in with him for 11 days while he was tube fed minimal amounts, and his brother was at home. After that neither would latch and my supply crashed to 300ml per day.
I upped my pumping to every 2 hours round the clock and only ever got up to 600ml a day. I kept this up until they were 7 months old and it nearly broke me completely. Looking back I should have stopped much sooner.
It definitely is possible, and your chances are better if your babies are a good weight, aren't separated from you, you get lots of opportunity to latch early and so on. It's not impossible if you don't get those things, but I'd urge you to be as informed as possible before they arrive on latch, normal feeding behaviour, signs of a problem and where to get help if you need it. And if it doesn't work out, don't beat yourself up over it for months on end and torture yourself - I never thought I would be like that, but it was really unhealthy for me and my babies. The most important thing when you have twins is doing the best you can and making your peace with that!