HoT:Verdant Brink - 110 hp total - 1 veteran (easy soloable), 7 communes = 80 hp solo
Auric Basin - 110 hp total - bacon hero point + 2 commune, if you go into the hole after AB octovine meta you can pretty much always get the champion fight against the exlated there too. additionally, the golem hero point here only spawns champions for hp trains- if you go alone, it's 3 veteran golems which are easy enough to solo (theres another commune but guarded by a champion) = 30 hp solo, 40 hp if you go in after meta, 50 if you take on golem alone
Tangled Depths - 110 hp total - 3 commune (one requires itzel mastery 4 and needs long stealth or is inaccessable if chak driver is up)(theres an extra commune but the mushrooms that guard it are hard to solo) = 30 hp solo
Dragon's Stand - 70 hp total - ALL communes, but 4 are locked behind meta- on the other hand, meta is very easy to do and you just need to be aware of the timer - event timer wiki page for that = 30 hp without meta and 70 hp with meta.
TOTAL = 80 + 50 + 30 + 70 = 230 hero points with easy solos.You need 250 hero points per elite spec- that's only 20 hp off of maxing an elite spec. Mind also that, pretty much with exception to the mushroom queen in tangled depths, 2-3 players of average skill can kill all champion hero points even with sub par builds.
I don't know the stats or ins and outs of PoF because i don't spend much time there, but i do know this: EVERY fight is soloable by the average player, but some fights take a lot of effort and learning to solo compared to other fights. 60 hero points are somewhat difficult to do alone.
branded ogre and dust mite twister in highlands and awakened family in vabbi hero points are pretty easy but if you don't know how they attack very easy to fail also. (dust twister = dodge when it knocksdown, very difficult due to lack of visual indicator- mostly familiarity in timings for this one. stun breaks help)(branded ogre = dodge during it's big knockback - familiarity again but much easier to tell when he's gonna do this attack due to visual cue. can also stand with back to the crystal to avoid getting knocked off platform)(awakened family = mostly a case of being on point with avoiding AoE circles, there's a couple family members which apply cripple - this is the BIGGEST killer, as cripple makes it hard to run out of aoe circles. condi cleanses help or avoiding cripple attacks)
Harpy and shannah the whatever hero points in desolation often need two people sheerly due to the high amount of damage the harpy/shannah do- but kiting works for both fights, a little harder to kite shannah though due to the frequency of attacks (anything able to generate quickness and alacrity, or have endurance generation boosts will have a significantly easier time with her), for harpy you can get it's minions on low hp and kill them when downed to rally. dodge back and go to ranged weapons when harpy places tornado.
Finally, magic muddled djinn in crystal oasis is a very soloable hp, but it's not the hero point which kills- it's the hydras/sand lions which aggro to the fight. it's VERY hard to avoid their aggro (but is possible) and once they're involved, the fight is no longer soloable for most. sheer numbers are the only answer to this for the average player. (luckily, numbers only means 2-4 people depending on skill).
edit: oh yeah two more hero points to mention in elon riverlands.branded forgotten preist hp = watch from a safe place near the cave/high on the ridge above, wait until the branded hydra passes then go to the hp without attracting it's aggro. once you start the hero point pressure the forgotten priest into the WALL so when the hydra passes you it won't aggro. as long as you avoid the aggro of the hydra the fight is easy, so beware when dodging backwards - you'll only narrowly avoid the hydras aggro by getting as tight to the wall as possible, when the hydra appraoches stop fighting to hug the wall- you can tank the damage from the preist, but the hydra will end most players.
trunt? whatever the giants name is = maybe the only hero point in all of PoF i'd call truly hard. i managed to solo him once, but honestly, i forgot how lol. his high damage combined with knockdown + taunt combo will leave you incapacitated and eating damage if you're face tanking it...pets and minions help a lot if you have them as they can eat those attacks instead. Stun breaks or otherwise being familiar enough to deal with his CC attacks is the big thing here, and always dodge SIDEWAYS to avoid his attacks - which run in a straight line/cone sort of projection for a long distance, hense a mistimed dodge backwards can often end up with you taking the attack you meant to avoid.