Here is the full list of all 48 Time Survivors achievements.
Upgrade Telescope to maximum level
Upgrade Amoeba to max level during a run
Upgrade Slingshot to max level during a run
Meet the Mortician
Find 3 Giga Magnets
Use the Red Leech for more than 600 seconds in total
Recover 2000 Health Points by any means
Use the Tesla Coil for more than 600 seconds in total
Upgrade Ice Orb to max level during a run
Deal a total of 500.000 damage with any fire weapon
Get 300 gold
Get 5 Apples
Kill 2023 enemies
Defeat 3 Cerberi in a single run
Destroy 20 vases
Meet your first huge monster dog, the Barghest
Survive 6 minutes with Claire
Find 3 Magic Mushrooms
50 Gold turns into 100. Buy upgrades at the Shop!
Kill 222 Evil Priests
Reach Level 66 with Nik in any stage
Walk 20 Km
Reach Level 5 with any character
Defeat a total of 5000 enemies
Kill 1000 scarabs
Reach minute 14:40 in The Dark Age stage
Death is the way
Reach Level 10 with any character
Play a run in the full "Time Survivors"
Complete "The Dark Age" stage
Deal a total of 1.000.000 damage with the Shuriken
Reach level 16 with Mulan in "The Stone Age" stage
Kill 96 Triceratops
Survive 5 minutes with Ned
Complete the Egypt Age stage
Reach Level 10 with Ned
Kill 10 T-Rexes
Complete "The Egypt Age" stage
Upgrade Plasma Gun to max level during a run
Upgrade Shuriken to max level during a run
Survive 20 minutes with Ned
Kill the flying Pyramid
Survive 20 minutes as Cleo
Reach 25% in the Meta progression
Reach 50% in the Meta progression
Reach 75% in the Meta progression
Reach 100% in the Meta progression
Reach minute 5:55 in The Ice Age stage