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