Final answer:
The Achaeans, in different assemblies, made decisions regarding military and political strategies, such as forming the Hellenic League during the Persian Wars and retreating inside Athens' walls during the Peloponnesian War.
Step-by-step explanation:
In the context of the assemblies held by the Achaeans or ancient Greeks, decisions could range from military strategies to political actions. However, without a specific mention of which assembly or event in question, it is challenging to provide a definitive answer. For example, during a crucial period of the Persian Wars, the Greek city-states decided in assembly to unite as allies and formed the Hellenic League, leading to courageous stands such as the Battle of Thermopylae. In another instance, Athenian citizens, under the leadership of Pericles, decided during an assembly to pull back within the walls of Athens and rely on their navy during the Peloponnesian War. As for the Trojan War, which involved Achaeans such as Achilles and Ajax, the assemblies mentioned in literature like Homer's Iliad often dealt with military tactics against Troy and internal disputes among the Greek kings.