The fight starts Achilles vs Aramis Then the other musketeers join the fight in 10 sec intervals. The order is - Porthos, Athos, D'Artagnan then Captain Rochefort 20 seconds after him. Fight's in The place where D'Artagnan and the musketeers duel was to take place. the musketeers have all weaponry they had in the movie barring their guns.
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I doubt he can do much against Aramis and Porthos. But once Athos comes in it's pretty much over. If he somehow survives further, then there's no way he can stand against D'artagnan and Rochefort too.
Achilles can probably take on any two of them at the same time, especially if he's armed with spear and shield. He'd be wise not to use his sword since the rapiers have a big reach advantage over the gladius. But once it gets to 3 vs. 1 Achilles will be in big trouble. The musketeers aren't pushovers, and those rapiers are deceptively fast. Achilles's only hope in surviving this match is to kill off a musketeer before a new one joins in and keep the fight to 2 vs. 1. His spear gives him a reach advantage and his shield and armor give him a defensive advantage that will work against 2. Against 3 and they'll wear him down. Against 4 and he gets skewered.
Any of them are skilled enough to last 10 seconds against him. As they were actually pretty beastly throughout the film. He gets overwhelmed in no time.