Here is the full list of all 24 Jagged Alliance Flashback achievements.
Hire 5 Mercenaries
Train 75 militia squads
Heal 5 mercenaries in doctor mode
Kill 100 Enemies
Use 5 bandages
Train 25 militia squads
Train 5 militia squads
Complete a side mission
Complete all side missions
Complete the Spice questline
Complete the first mission
Kill 25 enemies
Find a way to Angetta
Kill the prince and complete the game
Kill 500 enemies
Destroy 10 environment pieces
Destroy 50 environment pieces
Destroy 100 environment pieces
Use 25 bandages
Use 50 bandages
Heal 50 mercenaries in doctor mode
Heal 100 mercenaries in doctor mode
Hire 15 Mercenaries
Hire 50 Mercenaries